Techniques for transmitting and receiving downlink control information for a set of noma downlink transmissions

ABSTRACT

Techniques are described for wireless communication. A first method includes receiving downlink control information for a first UE based at least in part on a group identifier associated with a NOMA group including the first UE and at least a second UE; and receiving a set of NOMA downlink transmissions at the first UE based at least in part on the downlink control information for the first UE. A second method includes receiving downlink control information for a first UE, the downlink control information for the first UE including an indication of at least a second UE; receiving downlink control information for the second UE based at least in part on the indication of at least the second UE; and receiving a set of NOMA downlink transmissions at the first UE based at least in part on the downlink control information for the first UE and the downlink control information for the second UE.

CROSS REFERENCES

The present application for patent claims priority to U.S. ProvisionalPatent Application No. 62/044,787 by Sun et al., entitled “Techniquesfor Transmitting and Receiving Downlink Control Information for a Set ofNOMA Downlink Transmissions,” filed Sep. 2, 2014, and U.S. ProvisionalApplication No. 62/044,850 by Sun et al., entitled “Techniques forCanceling Interference by Wireless Devices,” filed Sep. 2, 2014,assigned to the assignee hereof, and expressly incorporated by referenceherein.

FIELD OF THE DISCLOSURE

The present disclosure, for example, relates to wireless communicationsystems, and more particularly to techniques for transmitting andreceiving downlink control information for a set of non-orthogonalmultiple access (NOMA) downlink transmissions.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be multiple-accesssystems capable of supporting communication with multiple users bysharing the available system resources (e.g., time, frequency, andpower). Examples of such multiple-access systems include code-divisionmultiple access (CDMA) systems, time-division multiple access (TDMA)systems, frequency-division multiple access (FDMA) systems, orthogonalfrequency-division multiple access (OFDMA) systems, and NOMA systems.Additionally, some systems may operate using time-division duplex (TDD),in which a single carrier is used for both uplink and downlinkcommunications, and some systems may operate using frequency-divisionduplex (FDD), in which separate carrier frequencies are used for uplinkand downlink communications.

By way of example, a wireless multiple-access communication system mayinclude a number of base stations, each simultaneously supportingcommunication for multiple communication devices, otherwise known asuser equipments (UEs). A base station may communicate with UEs ondownlink channels (e.g., for transmissions from a base station to a UE)and uplink channels (e.g., for transmissions from a UE to a basestation).

As wireless communications systems become more congested, operators areseeking ways to increase capacity. Various approaches include the use ofsmall cells, the use of an unlicensed radio frequency spectrum band, orthe use of wireless local area networks (WLANs) to offload some of thetraffic or signaling of a wireless communication system. Anotherapproach includes the transmission of a set of NOMA downlinktransmissions to increase the capacity of a wireless communicationsystem. The transmission of a set of NOMA downlink transmissions mayincrease capacity using existing system resources. Many of theapproaches for enhancing capacity may cause interference with concurrentcommunications in a cell. In order to provide enhanced data ratesthrough a wireless communication system, it may be beneficial tomitigate such interference.

SUMMARY

The present disclosure, for example, relates to one or more techniquesfor transmitting and receiving downlink control information for a set ofNOMA downlink transmissions. A set of NOMA downlink transmissions mayinclude downlink transmissions for multiple UEs, including, for example,a first downlink transmission for a first UE and a second downlinktransmission for a second UE. The resources (e.g., resource blocks) usedby the second downlink transmission may partially or fully overlap theresources used by the first downlink transmission. In some examples, aUE may perform one or more interference cancellation operations on a setof NOMA downlink transmissions, to cancel downlink transmissions thatare not intended for the UE, and to enable an identification of adownlink transmission that is intended for the UE. To perform aninterference cancellation operation on a set of NOMA downlinktransmissions, a UE may need to know the parameters for the downlinktransmission(s) to be canceled.

Prior to transmitting a set of NOMA downlink transmissions, a basestation may transmit downlink control information to each of the UEshaving a downlink transmission in the set of NOMA downlinktransmissions. Techniques disclosed herein enable downlink controlinformation to be transmitted such that a first UE may receive thedownlink control information for at least a second UE, thereby enablingthe first UE to obtain the parameters for a downlink transmission for atleast the second UE. A first set of techniques involves the definitionof a NOMA group, in which a group of UEs, for which downlinktransmissions may be included in a NOMA group, is assigned a groupidentifier. Downlink control information for the downlink transmissionsincluded in a set of NOMA downlink transmissions may then be transmittedand received using the group identifier (e.g., encoded and decoded usingthe group identifier), such that any UE having knowledge of the groupidentifier may receive the downlink control information of any UE in theNOMA group. A second set of techniques involves blindly detecting thedownlink control information for the UEs for which downlinktransmissions are included in a set of NOMA downlink transmissions. Athird set of techniques involves including an indication of at least asecond UE, which second UE has a downlink transmission included in a setof NOMA downlink transmissions, in the downlink control information fora first UE having a downlink transmission included in the set of NOMAdownlink transmissions. The first UE may use the indication of at leastthe second UE to receive downlink control information for at least thesecond UE. A fourth set of techniques involves the forwarding ofdownlink control information for a second UE, which second UE has adownlink transmission included in a set of NOMA downlink transmissions,to a first UE having a down link transmission included in the set ofNOMA downlink transmissions.

In a first set of illustrative examples, a method for wirelesscommunication is described. In one configuration, the method may includereceiving downlink control information for a first UE based at least inpart on a group identifier associated with a NOMA group including thefirst UE and at least a second UE. The method may also include receivinga set of NOMA downlink transmissions at the first UE based at least inpart on the downlink control information for the first UE.

In some examples of the method, receiving the downlink controlinformation for the first UE may include receiving the downlink controlinformation for the first UE based at least in part on a deterministicfunction of the group identifier and a UE identifier assigned to thefirst UE

In some examples, the method may include receiving the group identifierfrom a base station. In some examples, the group identifier may bereceived from the base station during a random access procedure.

In some examples of the method, the downlink control information for thefirst UE may reference a first UE identifier assigned to the first UE.In some examples, the method may include identifying the downlinkcontrol information for the first UE based at least in part on the firstUE identifier. In some examples, the method may include identifying, inthe set of NOMA downlink transmissions, a first downlink transmissionfor the first UE using a first RNTI based at least in part on the firstUE identifier. In some examples of the method, the first RNTI may bebased at least in part on a deterministic function of the first UEidentifier and the group identifier.

In some examples, the method may include receiving downlink controlinformation for at least the second UE based at least in part on thegroup identifier associated with the NOMA group. In some examples of themethod, receiving the downlink control information for the second UE mayinclude receiving the downlink control information for the second UEbased at least in part on a deterministic function of the groupidentifier and a second UE identifier assigned to the second UE. In someexamples, the method may include receiving a range of UE identifiersassociated with the NOMA group. The range of UE identifiers may includeat least the second UE identifier.

In some examples, the method may include determining, based at least inpart on the downlink control information for the first UE and thedownlink control information for at least the second UE, that aninterfering transmission overlaps a downlink transmission for the firstUE. In some examples, the method may include performing an interferencecancellation operation on the interfering transmission based at least inpart on the downlink control information for at least the second UE. Insome examples of the method, the downlink control information for atleast the second UE may reference a second UE identifier assigned to thesecond UE. In some examples of the method, the interference cancellationoperation may be performed using a second RNTI based at least in part onthe second UE identifier. In some examples of the method, the secondRNTI may be based at least in part on a deterministic function of thesecond UE identifier and the group identifier. In some examples of themethod, receiving the downlink control information for at least thesecond UE may include receiving all downlink control informationassociated with the NOMA group based at least in part on the groupidentifier.

In a second set of illustrative examples, an apparatus for wirelesscommunication is described. In one configuration, the apparatus mayinclude means for receiving downlink control information for a first UEbased at least in part on a group identifier associated with a set ofNOMA group including the first UE and at least a second UE. Theapparatus may also include means for receiving a set of NOMA downlinktransmissions at the first UE based at least in part on the downlinkcontrol information for the first UE. In some examples, the apparatusmay further include means for implementing one or more aspects of themethod for wireless communication described above with respect to thefirst set of illustrative examples.

In a third set of illustrative examples, another apparatus for wirelesscommunication is described. In one configuration, the apparatus mayinclude a processor, and memory coupled to the processor. The processormay be configured to receive downlink control information for a first UEbased at least in part on a group identifier associated with a set ofNOMA group including the first UE and at least a second UE. Theprocessor may also be configured to receive a set of NOMA downlinktransmissions at the first UE based at least in part on the downlinkcontrol information for the first UE. In some examples, the processormay further be configured to implement one or more aspects of the methodfor wireless communication described above with respect to the first setof illustrative examples.

In a fourth set of illustrative examples, a computer-readable medium forstoring instructions executable by a processor is described. In oneconfiguration, the computer-readable medium may include instructions toreceive downlink control information for a first UE based at least inpart on a group identifier associated with a set of NOMA group includingthe first UE and at least a second UE. The computer-readable medium mayalso include instructions to receive a set of NOMA downlinktransmissions at the first UE based at least in part on the downlinkcontrol information for the first UE. In some examples, thecomputer-readable medium may also include instructions to implement oneor more aspects of the method for wireless communication described abovewith respect to the first set of illustrative examples.

In a fifth set of illustrative examples, another method for wirelesscommunication is described. In one configuration, the method may includereceiving downlink control information for a first UE, the downlinkcontrol information for the first UE including an indication of at leasta second UE. The method may also include receiving downlink controlinformation for the second UE based at least in part on the indicationof at least the second UE, and receiving a set of NOMA downlinktransmissions at the first UE based at least in part on the downlinkcontrol information for the first UE and the downlink controlinformation for the second UE.

In some examples of the method, the indication of at least the second UEmay include an indication of the second UE, and receiving the downlinkcontrol information for the second UE may include receiving the downlinkcontrol information for the second UE based at least in part on theindication of the second UE.

In some examples, the method may include determining, based at least inpart on the downlink control information for the first UE and thedownlink control information for at least the second UE, that aninterfering transmission overlaps a first downlink transmission for thefirst UE. In these examples, the method may also include performing aninterference cancellation operation on the interfering transmissionbased at least in part on the downlink control information for at leastthe second UE.

In some examples of the method, the indication of at least the second UEmay include an RNTI associated with the second UE. In some examples ofthe method, the indication of at least the second UE may include anindex associated with a set of other UEs that can be configured tooperate in a NOMA group with the first UE. In some examples, the methodmay include determining an RNTI associated with the second UE based atleast in part on the index.

In a sixth set of illustrative examples, another apparatus for wirelesscommunication is described. In one configuration, the apparatus mayinclude means for receiving downlink control information for a first UE.The downlink control information for the first UE may include anindication of at least a second UE. The apparatus may also include meansfor receiving downlink control information for the second UE based atleast in part on the indication of at least the second UE, and means forreceiving a set of NOMA downlink transmissions at the first UE based atleast in part on the downlink control information for the first UE andthe downlink control information for the second UE. In some examples,the apparatus may further include means for implementing one or moreaspects of the method for wireless communication described above withrespect to the fifth set of illustrative examples.

In a seventh set of illustrative examples, another apparatus forwireless communication is described. In one configuration, the apparatusmay include a processor, and memory coupled to the processor. Theprocessor may be configured to receive downlink control information fora first UE. The downlink control information for the first UE mayinclude an indication of at least a second UE. The processor may also beconfigured to receive downlink control information for the second UEbased at least in part on the indication of at least the second UE, andreceive a set of NOMA downlink transmissions at the first UE based atleast in part on the downlink control information for the first UE andthe downlink control information for the second UE. In some examples,the processor may further be configured to implement one or more aspectsof the method for wireless communication described above with respect tothe fifth set of illustrative examples.

In an eighth set of illustrative examples, another computer-readablemedium for storing instructions executable by a processor is described.In one configuration, the computer-readable medium may includeinstructions to receive downlink control information for a first UE. Thedownlink control information for the first UE may include an indicationof at least a second UE. The computer-readable medium may also includeinstructions to receive downlink control information for the second UEbased at least in part on the indication of at least the second UE, andinstructions to receive a set of NOMA downlink transmissions at thefirst UE based at least in part on the downlink control information forthe first UE and the downlink control information for the second UE. Insome examples, the computer-readable medium may also includeinstructions to implement one or more aspects of the method for wirelesscommunication described above with respect to the fifth set ofillustrative examples.

In a ninth set of illustrative examples, another method for wirelesscommunication is described. In one configuration, the method may includereceiving, at a first UE, at least one control channel elementassociated with the first UE. The at least one control channel elementmay include downlink control information for the first UE and at least asecond UE. The method may also include receiving a set of NOMA downlinktransmissions at the first UE based at least in part on the downlinkcontrol information for the first UE and at least the second UE.

In some examples of the method, receiving the at least one controlchannel element may include receiving a single control channel elementassociated with the first UE. The single control channel element mayinclude the downlink control information for the first UE and at leastthe second UE.

In some examples of the method, receiving the at least one controlchannel element may include receiving a first control channel elementassociated with the first UE, with the first control channel elementincluding the downlink control information for the first UE, andreceiving at least a second control channel element associated with thefirst UE, with at least the second control channel element including thedownlink control information for at least the second UE.

In some examples, the method may include determining, based at least inpart on the downlink control information for the first UE and thedownlink control information for at least the second UE, that aninterfering transmission overlaps a first downlink transmission for thefirst UE. The method may also include performing an interferencecancellation operation on the interfering transmission based at least inpart on the downlink control information for at least the second UE. Insome examples of the method, receiving the at least one control channelelement may include receiving a UE identifier associated with the secondUE, and performing the interference cancellation operation on theinterfering transmission may be further based at least in part on the UEidentifier. In some examples of the method, the UE identifier mayinclude an RNTI associated with the second UE, and performing theinterference cancellation operation on the interfering transmission mayinclude decoding (e.g., descrambling (e.g., cyclic redundancy check(CRC)-descrambling) the interfering transmission using the RNTIassociated with the UE identifier.

In a tenth set of illustrative examples, another apparatus for wirelesscommunication is described. In one configuration, the apparatus mayinclude means for receiving, at a first UE, at least one control channelelement associated with the first UE. The at least one control channelelement may include downlink control information for the first UE and atleast a second UE. The apparatus may also include receiving a set ofNOMA downlink transmissions at the first UE based at least in part onthe downlink control information for the first UE and at least thesecond UE. In some examples, the apparatus may further include means forimplementing one or more aspects of the method for wirelesscommunication described above with respect to the ninth set ofillustrative examples.

In an eleventh set of illustrative examples, another apparatus forwireless communication is described. In one configuration, the apparatusmay include a processor, and memory coupled to the processor. Theprocessor may be configured to receive, at a first UE, at least onecontrol channel element associated with the first UE. The at least onecontrol channel element may include downlink control information for thefirst UE and at least a second UE. The processor may also be configuredto receive a set of NOMA downlink transmissions at the first UE based atleast in part on the downlink control information for the first UE andat least the second UE. In some examples, the processor may further beconfigured to implement one or more aspects of the method for wirelesscommunication described above with respect to the ninth set ofillustrative examples.

In a twelfth set of illustrative examples, another computer-readablemedium for storing instructions executable by a processor is described.In one configuration, the computer-readable medium may includeinstructions to receive, at a first UE, at least one control channelelement associated with the first UE. The at least one control channelelement may include downlink control information for the first UE and atleast a second UE. The computer-readable medium may also includeinstructions to receive a set of NOMA downlink transmissions at thefirst UE based at least in part on the downlink control information forthe first UE and at least the second UE. In some examples, thecomputer-readable medium may also include instructions to implement oneor more aspects of the method for wireless communication described abovewith respect to the ninth set of illustrative examples.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purpose ofillustration and description, and not as a definition of the limits ofthe claims.

BRIEF DESCRIPTION OF THE DRAWINGS

A further understanding of the nature and advantages of the presentinvention may be realized by reference to the following drawings. In theappended figures, similar components or features may have the samereference label. Further, various components of the same type may bedistinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label.

FIG. 1 illustrates an example of a wireless communications system, inaccordance with various aspects of the disclosure;

FIG. 2 shows a message flow between a base station, a first UE, and asecond UE, in accordance with various aspects of the present disclosure;

FIG. 3 shows a message flow between a base station, a first UE, and asecond UE, in accordance with various aspects of the present disclosure;

FIG. 4 shows a message flow between a base station, a first UE, and asecond UE, in accordance with various aspects of the present disclosure;

FIG. 5 shows a block diagram of an apparatus for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 6 shows a block diagram of an apparatus for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 7 shows a block diagram of an apparatus for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 8 shows a block diagram of an apparatus for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 9 shows a block diagram of an apparatus for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 10 shows a block diagram of an apparatus for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 11 shows a block diagram of a UE for use in wireless communication,in accordance with various aspects of the present disclosure;

FIG. 12 shows a block diagram of a base station (e.g., a base stationforming part or all of an eNB) for use in wireless communication, inaccordance with various aspects of the present disclosure;

FIG. 13 is a block diagram of a multiple input/multiple output (MIMO)communication system including a base station and a UE, in accordancewith various aspects of the present disclosure;

FIG. 14 is a flow chart illustrating an example of a method for wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 15 is a flow chart illustrating an example of a method for wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 16 is a flow chart illustrating an example of a method for wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 17 is a flow chart illustrating an example of a method for wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 18 is a flow chart illustrating an example of a method for wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 19 is a flow chart illustrating an example of a method for wirelesscommunication, in accordance with various aspects of the presentdisclosure;

FIG. 20 shows a wireless communication system in which transmissions byvarious wireless devices may interfere with receptions of transmissionsby various other wireless devices, in accordance with various aspects ofthe present disclosure;

FIG. 21 shows a table of various TDD uplink-downlink (UL/DL)configurations (e.g., configurations 0, 1, 2, 3, 4, 5, and 6) used for aframe of communications in an LTE system, in accordance with variousaspects of the present disclosure;

FIG. 22 shows a wireless communication system in which LTE/LTE-A may bedeployed under different scenarios using an unlicensed radio frequencyspectrum band, in accordance with various aspects of the presentdisclosure;

FIG. 23 shows a message flow between a first UE, a second UE, and a basestation, in accordance with various aspects of the present disclosure;

FIG. 24 shows a message flow between a first UE, a second UE, a firstbase station, and a second base station, in accordance with variousaspects of the present disclosure;

FIG. 25 shows a message flow between a first UE, a second UE, a firstbase station, and a second base station, in accordance with variousaspects of the present disclosure;

FIG. 26 shows a message flow between a first UE, a second UE, a firstbase station, and a second base station, in accordance with variousaspects of the present disclosure;

FIG. 27 shows a message flow between a first UE, a second UE, a firstbase station, and a second base station, in accordance with variousaspects of the present disclosure;

FIG. 28 shows a block diagram of a wireless apparatus for use inwireless communication, in accordance with various aspects of thepresent disclosure;

FIG. 29 shows a block diagram of a wireless apparatus for use inwireless communication, in accordance with various aspects of thepresent disclosure;

FIG. 30 shows a block diagram of a wireless apparatus for use inwireless communication, in accordance with various aspects of thepresent disclosure;

FIG. 31 shows a block diagram of a wireless apparatus for use inwireless communication, in accordance with various aspects of thepresent disclosure;

FIG. 32 shows a block diagram of a UE for use in wireless communication,in accordance with various aspects of the present disclosure;

FIG. 33 shows a block diagram of a base station (e.g., a base stationforming part or all of an eNB) for use in wireless communication, inaccordance with various aspects of the present disclosure;

FIG. 34 is a flow chart illustrating an example of a method for wirelesscommunication, in accordance with various aspects of the presentdisclosure; and

FIG. 35 is a flow chart illustrating an example of a method for wirelesscommunication, in accordance with various aspects of the presentdisclosure.

DETAILED DESCRIPTION

Techniques are described for transmitting and receiving downlink controlinformation for a set of NOMA downlink transmissions. In some examples,a base station (e.g., a base station including an enhanced Node B (eNB))or a UE may be configured to operate within a wireless communicationsystem and transmit or receive wireless communications on a basemodulation layer as well as on an enhancement modulation layer that ismodulated on the base modulation layer. Thus, concurrent, non-orthogonaldata streams may be provided to the same or different UEs, and eachmodulation layer may be used to transmit content that may be selectedbased on particular deployments or channel conditions. Such concurrent,non-orthogonal data streams may be referred to as a set of NOMAtransmissions, and in the case of downlink transmissions, a set of NOMAtransmissions may be referred to as a set of NOMA downlinktransmissions. Various interference mitigation techniques may beimplemented to compensate for interfering signals received from within acell.

In some examples, a set of NOMA downlink transmissions may be providedto a UE from a base station through hierarchical modulation, in whichfirst content may be selected for transmission on a base modulationlayer and different content may be selected for transmission on anenhancement modulation layer. The base modulation layer content may bemodulated onto the base modulation layer, and then the enhancement layercontent may be modulated onto the enhancement modulation layer. Theenhancement modulation may be superpositioned on the base modulationlayer and transmitted to one or more UE(s). In some examples, a UE maytransmit multiple hierarchical layers to a base station in a similarmanner.

A UE receiving both the base modulation layer and the enhancementmodulation layer may decode content received on the base modulationlayer, and then perform interference cancellation to cancel the signalof the base modulation layer. The UE may then decode content received onthe enhancement modulation layer.

In some examples, the base modulation layer may support transmissionshaving a higher likelihood of transmission success, and the basemodulation layer may be used to transmit content having a relativelylower error threshold. The enhancement modulation layer, in someexamples, may support transmissions having relatively lower likelihoodof transmission success, and may be used for transmission of contenthaving a relatively higher error threshold.

When a plurality of downlink transmissions in a set of NOMA downlinktransmissions share some or all of the same resources (e.g., havepartially or fully overlapping resource blocks), a UE may perform aninterference cancellation operation on one or more downlinktransmissions included in the set of NOMA downlink transmissions toidentify one of the downlink transmissions that is intended for the UE.To perform an interference cancellation operation on a set of NOMAdownlink transmissions, a UE may need to know the parameters for thedownlink transmission(s) to be canceled. These parameters may beacquired from downlink control information for the downlinktransmission(s). In some examples, the downlink control information maybe included in a physical downlink control channel (PDCCH) or enhancedPDCCH (ePDCCH).

The following description provides examples, and is not limiting of thescope, applicability, or examples set forth in the claims. Changes maybe made in the function and arrangement of elements discussed withoutdeparting from the spirit and scope of the disclosure. Various examplesmay omit, substitute, or add various procedures or components asappropriate. For instance, the methods described may be performed in anorder different from that described, and various steps may be added,omitted, or combined. Also, features described with respect to someexamples may be combined in other examples.

FIG. 1 shows a block diagram of a wireless communication system 100, inaccordance with various aspects of the present disclosure. The wirelesscommunication system 100 may include a plurality of base stations 105(e.g., base stations forming parts or all of one or more eNBs), a numberof UEs 115, and a core network 130. Some of the base stations 105 maycommunicate with the UEs 115 under the control of a base stationcontroller (not shown), which may be part of the core network 130 orcertain ones of the base stations 105 in various examples. Some of thebase stations 105 may communicate control information or user data withthe core network 130 through backhaul 132. In some examples, some of thebase stations 105 may communicate, either directly or indirectly, witheach other over backhaul links 134, which may be wired or wirelesscommunication links. The wireless communication system 100 may supportoperation on multiple carriers (waveform signals of differentfrequencies). Multi-carrier transmitters can transmit modulated signalssimultaneously on the multiple carriers. For example, each communicationlink 125 may be a multi-carrier signal modulated according to variousradio technologies. Each modulated signal may be sent on a differentcarrier and may carry control information (e.g., reference signals,control channels, etc.), overhead information, data, etc.

The base stations 105 may wirelessly communicate with the UEs 115 viaone or more base station antennas. Each of the base stations 105 mayprovide communication coverage for a respective coverage area 110. Insome examples, a base station 105 may be referred to as an access point,a base transceiver station (BTS), a radio base station, a radiotransceiver, a basic service set (BSS), an extended service set (ESS), aNodeB, an evolved NodeB (eNB), a Home NodeB, a Home eNodeB, or someother suitable terminology. The coverage area 110 for a base station 105may be divided into sectors making up just a portion of the coveragearea. The wireless communication system 100 may include base stations105 of different types (e.g., macro, micro, or pico base stations). Thebase stations 105 may also utilize different radio technologies, such ascellular or WLAN radio access technologies. The base stations 105 may beassociated with the same or different access networks or operatordeployments (e.g., collectively referred to herein as “operators”). Thecoverage areas of different base stations 105, including the coverageareas of the same or different types of base stations 105, utilizing thesame or different radio technologies, or belonging to the same ordifferent access networks, may overlap.

In some examples, the wireless communication system 100 may include anLTE/LTE-A communication system (or network). In LTE/LTE-A communicationsystems, the term evolved NodeB or eNB may be, for example, used todescribe ones or groups of the base stations 105. In some examples, thewireless communication system 100 may include an LTE/LTE-A communicationsystem that supports hierarchical modulation and interferencecancellation, such as an LTE/LTE-A communication system that supportsthe transmission of a set of NOMA downlink transmissions. In someexamples, the wireless communication system 100 may support wirelesscommunication using one or more access technologies different fromLTE/LTE-A.

The wireless communication system 100 may be or include a HeterogeneousLTE/LTE-A network in which different types of base stations 105 providecoverage for various geographical regions. For example, each basestation 105 may provide communication coverage for a macro cell, a picocell, a femto cell, or other type of cell. Small cells such as picocells, femto cells, or other types of cells may include low power nodesor LPNs. A macro cell, for example, covers a relatively large geographicarea (e.g., several kilometers in radius) and may allow unrestrictedaccess by UEs with service subscriptions with the network provider. Apico cell would, for example, cover a relatively smaller geographic areaand may allow unrestricted access by UEs with service subscriptions withthe network provider. A femto cell would also, for example, cover arelatively small geographic area (e.g., a home) and, in addition tounrestricted access, may also provide restricted access by UEs having anassociation with the femto cell (e.g., UEs in a closed subscriber group(CSG), UEs for users in the home, and the like). An eNB for a macro cellmay be referred to as a macro eNB. An eNB for a pico cell may bereferred to as a pico eNB. And, an eNB for a femto cell may be referredto as a femto eNB or a home eNB. An eNB may support one or multiple(e.g., two, three, four, and the like) cells.

The core network 130 may communicate with the base stations 105 via abackhaul 132 (e.g., S1 application protocol, etc.). The base stations105 may also communicate with one another, e.g., directly or indirectlyvia backhaul links 134 (e.g., X2 application protocol, etc.) or viabackhaul 132 (e.g., through core network 130). The wirelesscommunication system 100 may support synchronous or asynchronousoperation. For synchronous operation, the eNBs may have similar frame orgating timing, and transmissions from different eNBs may beapproximately aligned in time. For asynchronous operation, the eNBs mayhave different frame or gating timing, and transmissions from differenteNBs may not be aligned in time.

The UEs 115 may be dispersed throughout the wireless communicationsystem 100. A UE 115 may also be referred to by those skilled in the artas a mobile device, a mobile station, a subscriber station, a mobileunit, a subscriber unit, a wireless unit, a remote unit, a wirelessdevice, a wireless communication device, a remote device, a mobilesubscriber station, an access terminal, a mobile terminal, a wirelessterminal, a remote terminal, a handset, a user agent, a mobile client, aclient, or some other suitable terminology. A UE 115 may be a cellularphone, a personal digital assistant (PDA), a wireless modem, a wirelesscommunication device, a handheld device, a tablet computer, a laptopcomputer, a cordless phone, a wearable item such as a watch or glasses,a wireless local loop (WLL) station, etc. A UE 115 may be able tocommunicate with macro eNBs, pico eNBs, femto eNBs, relays, and thelike. A UE 115 may also be able to communicate over different types ofaccess networks, such as cellular or other WWAN access networks, or WLANaccess networks. In some modes of communication with a UE 115,communication may be conducted over a plurality of communication links125 or channels (i.e., component carriers), with each channel using acomponent carrier between the UE 115 and one of a number of cells (e.g.,serving cells, which cells may in some cases be operated by the same ordifferent base stations 105).

The communication links 125 shown in wireless communication system 100may include uplink channels (using component carriers) for carryinguplink (UL) communications (e.g., transmissions from a UE 115 to a basestation 105) or downlink channels (using component carriers) forcarrying downlink (DL) communications (e.g., transmissions from a basestation 105 to a UE 115). The UL communications or transmissions mayalso be called reverse link communications or transmissions, while theDL communications or transmissions may also be called forward linkcommunications or transmissions. In some examples, one or more downlinkchannels may carry a set of NOMA downlink transmissions.

Depending on the proximity of the base stations 105 and/or UEs 115 withrespect to one another and/or other objects, the transmissions of onewireless device (e.g., a base station 105 or UE 115) may interfere withthe reception of transmissions at another wireless device (e.g., anotherbase station or UE 115). Examples of interference scenarios aredescribed with reference to FIG. 2. To combat this interference, a firstwireless device may use control information received for at least asecond wireless device to identify and cancel interfering transmissionsby or to the second wireless device. The control information may bereceived using an interfering group identifier associated with a groupto which the second wireless device belongs.

In some examples, the reception of downlink control information for atleast a second UE that has a downlink transmission included in a set ofNOMA downlink transmissions, at a first UE that has a downlinktransmission included in the set of NOMA downlink transmissions, may befacilitated by the establishment of a NOMA group. In some examples, abase station may define a NOMA group as a set of active UEs that maypotentially be served in NOMA fashion. In some examples, a NOMA groupmay include up to 256 UEs. In other examples, a NOMA group may includemore or fewer UEs. NOMA pairing of UEs (e.g., for downlink transmissionsover a base modulation layer and an enhancement modulation layer) aremade between UEs in a same NOMA group. In some examples, a base stationmay define multiple NOMA groups. Transmissions to UEs belonging todifferent NOMA groups may be orthogonal and may not share resources. ANOMA group may be identified by a group identifier. In some examples,the group identifier may include a group radio network temporaryidentifier (RNTI). All of the downlink control information (or PDCCHs orePDCCHs) transmitted to the UEs in a NOMA group may be encoded (e.g.,scrambled (e.g., cyclic redundancy check (CRC) scrambled)) using thegroup identifier (e.g., the group RNTI) for the NOMA group. As a result,any UE in a NOMA group that knows the group identifier for the NOMAgroup may decode (e.g., descramble (e.g., CRC-descramble)) the downlinkcontrol information (or PDCCHs or ePDCCHs) for any other UE in the NOMAgroup. This differs from the way downlink control information iscurrently transmitted in LTE/LTE-A communication systems, in whichdownlink control information for a UE is encoded (e.g., scrambled (e.g.,CRC-scrambled)) using an identifier of the UE (e.g., a UE identifier).FIG. 2 provides an example of how a NOMA group may be used to facilitatethe receipt of downlink control information at a UE.

FIG. 2 shows a message flow 200 between a base station 205, a first UE215, and a second UE 215-a, in accordance with various aspects of thepresent disclosure. In some examples, the base station 205 may be anexample of aspects of one or more of the base stations 105 describedwith reference to FIG. 1. In some examples, the first UE 215 or thesecond UE 215-a may be an example of aspects of one or more of the UEs115 described with reference to FIG. 1. In some examples, each of thefirst UE 215, the second UE 215-a, and in some examples other UEs (notshown), may be members of a NOMA group. Messages may be transmittedbetween the base station 205, the first UE 215, or the second UE 215-aover at least one radio frequency spectrum band.

As shown in FIG. 2, the base station 205 may transmit a respective UEidentifier to each of the UEs in the NOMA group. For example, the basestation 205 may transmit a first UE identifier 220 to the first UE 215and a second UE identifier 225 to the second UE 215-a. The first UEidentifier 220 may identify the first UE 215, and the second UEidentifier 325 may identify the second UE 315-a. In some examples, thebase station 205 may transmit a range of UE identifiers associated withthe NOMA group. A range of UE identifiers transmitted to the first UE215 may include, for example, the second UE identifier 225, and a rangeof UE identifiers transmitted to the second UE 215-a may include, forexample, the first UE identifier 220. In some examples, each of the UEsin the NOMA group, including the first UE 215 and the second UE 215-a,may transmit its UE identifier to the base station 205.

The base station 205 may also transmit a group identifier 230 to each ofthe UEs in the NOMA group (e.g., to the first UE 215 and the second UE215-a). In some examples, the group identifier may be transmitted to thefirst UE 215 and the second UE 215-a during a random access procedure.In some examples, the group identifier 230 may include a group RNTI.

The base station 205 may further transmit downlink control information235 to each of the UEs in the NOMA group (e.g., to the first UE 215 andthe second UE 215-a). In some examples, the downlink control information235 may be transmitted for a subframe of wireless communications betweenthe base station 205 and one or more of the UEs in the NOMA group. Insome examples, the downlink control information 235 may be transmittedat the beginning of a subframe. In some examples, the downlink controlinformation 235 may be transmitted in a PDCCH or ePDCCH. In someexamples, the downlink control information 235 may include downlinkcontrol information for each of the UEs, in the NOMA group, to which thebase station 205 intends to transmit a downlink transmission during asubframe. In a given subframe, the base station 205 may transmit adownlink transmission to all, some, or none of the UEs in the NOMAgroup. In some examples, the downlink control information 235 may bescrambled (e.g., CRC-scrambled) using the group identifier 230.

At block 240, the first UE 215 may receive the downlink controlinformation 235 and determine the UE(s) to which the downlink controlinformation 235 corresponds. In some examples, the downlink controlinformation received for a UE may be received based at least in part onthe group identifier. For example, the downlink control information forthe first UE may be decoded (e.g., descrambled (e.g., CRC-descrambled))using the group identifier, and the downlink control information for thesecond UE may be decoded (e.g., descrambled (e.g., CRC-descrambled))using the group identifier. In some examples, the downlink controlinformation received for a UE may be received based at least in part ona deterministic function (e.g., an exclusive-OR (XOR)) of the groupidentifier and a UE identifier. For example, the downlink controlinformation for the first UE may be decoded (e.g., descrambled (e.g.,CRC-descrambled)) based at least in part on a deterministic function ofthe group identifier and the first UE identifier, and the downlinkcontrol information for the second UE may be decoded (e.g., descrambled(e.g., CRC-descrambled)) based at least in part on a deterministicfunction of the group identifier and the second UE identifier.

In examples in which the downlink control information for a UE isscrambled using the group identifier 230, the operation(s) at block 240may include decoding (descrambling (e.g., CRC-descrambling) the downlinkcontrol information 235 using the group identifier 230, and determiningthe UEs to which the downlink control information 235 corresponds. Insome examples, the downlink control information 235 may be determined tocorrespond to a UE when it references (e.g., includes) a UE identifierof the UE. In examples in which the downlink control information for aUE is scrambled using a deterministic function of the group identifier230 and a UE identifier, the operation(s) at block 240 may includedecoding (descrambling (e.g., CRC-descrambling) the downlink controlinformation for a UE using the group identifier and the UE identifier,and determining that the downlink control information 235 corresponds tothe UE based at least in part on an ability to descramble the downlinkcontrol information for the UE. When the first UE 215 determines thatthe downlink control information 235 does not contain downlink controlinformation for the first UE 215, the first UE 215 may not perform anyoperations at blocks 245, 250, 260, or 265 (e.g., for a current subframeof wireless communications between the base station 205 and one or moreof the UEs in the NOMA group). When the first UE 215 determines that thedownlink control information 235 does contain downlink controlinformation for the first UE 215, the first UE 215 may process thedownlink control information for the first UE 215 to determine, forexample, a transmission format, data rate, rank, modulation and codingscheme (MCS), or hybrid automatic repeat request (HARD) information fora first downlink transmission (e.g., a first PDSCH transmission) for thefirst UE 215. The first downlink transmission may be received as part ofthe set of NOMA downlink transmissions 255. When the first UE 215determines that the downlink control information 235 contains downlinkcontrol information for the second UE 215-a or other UEs in the NOMAgroup, the first UE 215 may process the downlink control information foreach of the UEs represented in the downlink control information 235.

At block 245, the first UE 215 may determine a first RNTI correspondingto the first downlink transmission for the first UE. The first RNTI maybe determined based at least in part on the first UE identifier 220. Insome examples, the first RNTI may be determined based at least in parton a deterministic function (e.g., an XOR) of the first UE identifier220 and the group identifier 230. The first UE 215 may also determine asecond RNTI corresponding to a second downlink transmission for thesecond UE, or a respective RNTI corresponding to each downlinktransmission for each UE represented in the downlink control information235.

At block 250, the first UE 215 may determine, based at least in part ondownlink control information for the first UE 215, downlink controlinformation for the second UE 215-a, or downlink control information foreach UE represented in the downlink control information 235, whetherthere is an interfering transmission that overlaps the first downlinktransmission for the first UE (e.g., whether there is a transmissionthat may interfere with receipt of the first downlink transmission atthe first UE 215). In some examples, the interfering transmission mayinclude a second downlink transmission for the second UE. In someexamples, the interfering transmission may include a downlinktransmission for each of a number of UEs, other than the first UE 215,represented in the downlink control information 235. When the first UE215 determines that there is no interfering transmission, the first UE215 may not perform any operations at blocks 260 or 265 (e.g., for acurrent subframe of wireless communications between the base station 205and one or more of the UEs in the NOMA group).

At some point in time following transmission of the downlink controlinformation 235 (and in some examples, immediately following), the basestation 205 may transmit a set of NOMA downlink transmissions 255. Theset of NOMA downlink transmissions 255 may be received by each of theUEs in the NOMA group, including the first UE 215 and the second UE215-a. In some examples, the set of NOMA downlink transmissions 255 maybe received at the first UE 215 based at least in part on downlinkcontrol information for the first UE 215. In some examples, the set ofNOMA downlink transmissions 255 may also be received at the first UE 215based at least in part on downlink control information for the second UE215-a or other UEs represented in the downlink control information 235.

At block 260, and upon determining at block 245 that there is aninterfering transmission, the first UE 215 may perform an interferencecancellation operation (e.g., a codeword-level interference cancellation(CWIC) operation or a symbol-level interference cancellation (SLIC)operation) on the interfering transmission. The interferencecancellation operation may be performed on an interfering transmissioncorresponding to a UE based at least in part on received downlinkcontrol information for the UE. In some examples, the interferencecancellation operation may include decoding (e.g., descrambling (e.g.,CRC-descrambling)) an interfering transmission corresponding to a UEbased at least in part on a UE identifier for the UE. For example, aninterfering transmission corresponding to the second UE 215-a may bedescrambled (e.g., CRC-descrambled) based at least in part on the secondUE identifier 225 (or an RNTI) associated with the second UE 215-a. Insome examples, the first UE 215 may perform the interferencecancellation operation for each UE, other than the first UE 215, forwhich downlink control information is provided in the downlink controlinformation 235.

At block 265, the first UE 215 may identify, in the set of NOMA downlinktransmissions 255, the first downlink transmission for the first UE 215.The first downlink transmission for the first UE 215 may be identifiedusing the first UE identifier 220 (e.g., the first RNTI). In someexamples, identifying the first downlink transmission for the first UE215 may include decoding (e.g., descrambling (e.g., CRC-descrambling))the first downlink transmission for the first UE 215 based at least inpart on the first UE identifier 220.

In one example of the message flow described with reference to FIG. 2,the group identifier 230 may have a value of 0x800, the first UEidentifier 220 may have a value of 0x01, and the second UE identifier225 may have a value of 0x02. In a subframe of communications in whichthe first UE 215 and the second UE 215-a are both served in NOMA fashionby the base station 205, with all resource blocks assigned to both UEs(e.g., to the first UE 215 and to the second UE 215-a), a PDCCH1 may beassigned to the first UE 215 and be scrambled with the group identifier230 (e.g., 0x8000), and a PDCCH2 may be assigned to the second UE 215-aand be scrambled with the group identifier 230 (e.g., 0x8000). Also, aPDSCH1 scrambled with an RNTI having a value of 0x8001 (XOR(0x8000,0x01) may be transmitted to the first UE 215, and a PDSCH2 scrambledwith an RNTI having a value of 0x8002 (XOR(0x8000, 0x02) may betransmitted to the second UE 215-a. Upon receipt of the varioustransmissions at the first UE 215, the first UE 215 may receive both thePDCCH1 and the PDCCH2 using the group identifier (0x8000). Upondetermining that the PDCCH1 is for the first UE 215, the first UE 215may check the PDCCH2 to determine whether the PDSCH2 uses resourceblocks that overlap the resource blocks used by the PDSCH1. Upondetermining that the resource blocks assigned to the PDSCH1 and thePDSCH2 overlap, the first UE 215 may decode the PDSCH1 using parametersobtained from the PDCCH1, and decode the PDSCH2 using parametersobtained from the PDCCH2. The first UE 215 may then perform aninterference cancellation operation on the PDSCH2, thereby enabling thefirst UE 215 to identify the PDSCH1.

In some examples, the reception of downlink control information for atleast a second UE that has a downlink transmission included in a set ofNOMA downlink transmissions, at a first UE that has a downlinktransmission included in the set of NOMA downlink transmissions, may befacilitated by a blind detection of downlink control informationtransmitted to the second UE. In this approach, it may be assumed thatdownlink control information transmitted to the first UE offers littleif any help in detecting the downlink control information transmitted tothe second UE. To limit the number of blind detections that the first UEperforms, a base station may limit the aggregation level for NOMAtransmissions to a number such as four. The base station may also oralternatively adjust the power of the downlink control informationtransmitted to the second UE to help the first UE receive the downlinkcontrol information transmitted to the second UE. The first UE may insome examples detect an energy on one or more control channel elementsto determine if downlink control information for the second UE has beentransmitted. After the downlink control information for the second UE isblindly detected, the first UE may attempt to recover an RNTI from thedownlink control information. In some examples, the first UE maydetermine whether a location of the downlink control information for thesecond UE (or a location of a PDCCH or ePDCCH including the downlinkcontrol information for the second UE) is located in a search space forthe recovered RNTI. If not, the blindly detected downlink controlinformation may be considered a false alarm. If so, the first UE maydecode the downlink control information and determine whetherinformation such as the modulation order match. In some examples, afalse alarm may be declared if the posteriori probability for thedetected downlink control information is too low.

FIG. 3 shows a message flow 300 between a base station 305, a first UE315, and a second UE 315-a, in accordance with various aspects of thepresent disclosure. In some examples, the base station 305 may be anexample of aspects of one or more of the base stations 105 describedwith reference to FIG. 1. In some examples, the first UE 315 or thesecond UE 315-a may be an example of aspects of one or more of the UEs115 described with reference to FIG. 1. In some examples, each of thefirst UE 315, the second UE 315-a, and in some examples other UEs (notshown), may be served in NOMA fashion (e.g., as a NOMA group, regardlessof whether the NOMA group is defined as such). Messages may betransmitted between the base station 305, the first UE 315, or thesecond UE 315-a over at least one radio frequency spectrum band.

As shown in FIG. 3, the base station 305 may transmit a respective UEidentifier to each of the UEs in the NOMA group. For example, the basestation 305 may transmit a first UE identifier 320 (e.g., a first RNTI)to the first UE 315 and a second UE identifier 325 (e.g., a second RNTI)to the second UE 315-a. The first UE identifier 320 may identify thefirst UE 315, and the second UE identifier 325 may identify the secondUE 315-a. In other examples, each of the UEs in the NOMA group,including the first UE 315 and the second UE 315-a, may transmit its UEidentifier to the base station 305.

The base station 305 may further transmit downlink control information330 to one or more of the UEs in the NOMA group (e.g., to the first UE315 and the second UE 315-a). In some examples, the downlink controlinformation 330 may be transmitted for a subframe of wirelesscommunications between the base station 305 and one or more of the UEsin the NOMA group. In some examples, the downlink control information330 may be transmitted at the beginning of a subframe.

In some examples, the downlink control information 330 may includedownlink control information, such as a first PDCCH or first ePDCCH, forthe first UE 315. In some examples, the downlink control information 330may include downlink control information for other UEs in the NOMAgroup, such as a second PDCCH or second ePDCCH for the second UE 315-a.In some examples, the PDCCH or ePDCCH for one UE may include anindication of at least one other UE for which downlink controlinformation is transmitted. For example, when the downlink controlinformation 330 includes downlink control information for the first UE315 and at least the second UE 315-a, the downlink control informationfor the first UE 315 may include an indication of at least the second UE315-a (e.g., a second RNTI associated with the second UE 315-a) or thedownlink control information for the second UE 315 may include anindication of at least the first UE 315 (e.g., a first RNTI associatedwith the first UE 315). In other examples, the PDCCH or ePDCCH for oneUE may include an index associated with a set of other UEs that can beconfigured to operate in a NOMA group with the UE. For example, a firstPDCCH or first ePDCCH for the first UE 315 may include an indexassociated with a set of other UEs, including the second UE 315-a, thatcan be configured to operate in a NOMA group with the first UE 315.

At block 335, the first UE 315 may receive downlink control informationfor the first UE 315. In some examples, the downlink control informationfor the first UE 315 may be decoded (e.g., descrambled (e.g.,CRC-descrambled)) based at least in part on the first UE identifier 320(e.g., a first RNTI associated with the first UE 315). In some examples,receiving the downlink control information for the first UE 315 mayinclude receiving an indication of at least the second UE 315-a. In someexamples, the indication of at least the second UE 315-a may include anRNTI associated with the second UE 315-a. In other examples, theindication of at least the second UE 315-a may include an indexassociated with a set of other UEs that can be configured to operate ina NOMA group with the first UE 315. The set of other UEs may include thesecond UE 315-a. In some examples, the operation(s) at block 335 mayinclude determining an RNTI associated with the second UE 315-a based atleast in part on the index. In some examples, receiving the downlinkcontrol information for the first UE 315 may include receiving anindication of each of one or more other UEs for which downlink controlinformation is transmitted in the downlink control information 330.

In some examples, the number of bits available for providing theindication of at least the second UE 315-a in a PDCCH or ePDCCH may belimited, and the number of UEs that may be identified given the limitednumber of bits may be less than the number of UEs that may otherwise beincluded in a NOMA group. In these examples, the overlap of downlinktransmissions may likewise be limited.

In examples in which the indication of at least the second UE 315-aincludes an index associated with a set of other UEs that can beconfigured to operate in a NOMA group with the first UE 315, the basestation 305 may preselect the set of other UEs and maintain the set ofother UEs in a semi-static manner. In some examples, updating the set ofother UEs may require signaling and take a somewhat long time. However,pairings of the first UE 315 with UEs in the set of other UEs may beundertaken dynamically. In some examples, the number of UEs that may beincluded in the set of other UEs may be fixed. In some examples, theindication of at least the second UE 315-a may include a set of pairedUE indicator fields (PIFs), with each PIF providing an index into theset of other UEs. In some examples, the number of PIFs in a set of PIFsmay be fixed. In other examples, the number of PIFS in a set of PIFs maybe variable. In some examples, there may be a tradeoff between thenumber of pair-able UEs and the maximum number of paired UEs byproviding an ability to indicate any UE, but possibly fewer UEs in thedownlink control information for a UE (e.g., by providing an ability toinclude an RNTI of any UE in downlink control information for the firstUE) or by providing an ability to indicate selected UEs, but possiblymore UEs in the downlink control information for a UE (e.g., byproviding a plurality of PIFs).

At block 340, the first UE 315 may receive downlink control informationfor the second UE 315-a based at least in part on the indication of atleast the second UE 315-a. In some examples, the indication of at leastthe second UE may include an indication of the second UE 315-a (e.g.,the second UE identifier 325 or an RNTI associated with the second UE315-a), and the downlink control information for the second UE 315-a maybe decoded (e.g., descrambled (e.g., CRC-descrambled)) based at least inpart on the indication of the second UE 315-a.

At block 345, the first UE 315 may determine, based at least in part ondownlink control information for the first UE 315, downlink controlinformation for the second UE 315-a, or downlink control information forother UEs for which downlink control information is provided in thedownlink control information 330, whether there is an interferingtransmission (e.g., an interfering PDSCH transmission) that overlaps afirst downlink transmission (e.g., a first PDSCH transmission) for thefirst UE (e.g., whether there is a transmission that may interfere withreceipt of the first downlink transmission at the first UE 315). In someexamples, the interfering transmission may include a second downlinktransmission (e.g., a second PDSCH transmission) for the second UE315-a. In some examples, the interfering transmission may include adownlink transmission for each of a number of UEs, other than the firstUE 315, for which downlink control information is provided in thedownlink control information 330. When the first UE 315 determines thatthere is no interfering transmission, the first UE 315 may not performany further operations at blocks 355 or 360 (e.g., for a currentsubframe of wireless communications between the base station 305 and oneor more of the UEs of the NOMA group).

At some point in time following transmission of the downlink controlinformation 330 (and in some examples, immediately following), the basestation 305 may transmit a set of NOMA downlink transmissions 350. Theset of NOMA downlink transmissions 350 may be received by each of theUEs in the NOMA group, including the first UE 315 and the second UE315-a. In some examples, the set of NOMA downlink transmissions 350 maybe received at the first UE 315 based at least in part on downlinkcontrol information for the first UE 315. In some examples, the set ofNOMA downlink transmissions 350 may also be received at the first UE 315based at least in part on downlink control information for the second UE315-a or other UEs for which downlink control information is provided inthe downlink control information 330.

At block 355, and upon determining at block 345 that there is aninterfering transmission, the first UE 315 may perform an interferencecancellation operation (e.g., a CWIC operation) on each interferingtransmission. The interference cancellation operation may be performedon an interfering transmission corresponding to a UE based at least inpart on received downlink control information for the UE. In someexamples, the interference cancellation operation may include decoding(e.g., descrambling (e.g., CRC-descrambling)) an interferingtransmission corresponding to a UE based at least in part on a UEidentifier for the UE. For example, an interfering transmissioncorresponding to the second UE 315-a may be descrambled (e.g.,CRC-descrambled) based at least in part on the second UE identifier 325(or an RNTI) associated with the second UE 315-a. In some examples, thefirst UE 315 may perform the interference cancellation operation foreach UE, other than the first UE 315, for which downlink controlinformation is provided in the downlink control information 330.

At block 360, the first UE 315 may identify, in the set of NOMA downlinktransmissions 350, the first downlink transmission for the first UE 315.The first downlink transmission for the first UE 315 may be identifiedusing the first UE identifier 320 (e.g., the first RNTI). In someexamples, identifying the first downlink transmission for the first UE315 may include decoding (e.g., descrambling (e.g., CRC-descrambling))the first downlink transmission for the first UE 315 based at least inpart on the first UE identifier 320.

FIG. 4 shows a message flow 400 between a base station 405, a first UE415, and a second UE 415-a, in accordance with various aspects of thepresent disclosure. In some examples, the base station 405 may be anexample of aspects of one or more of the base stations 105 describedwith reference to FIG. 1. In some examples, the first UE 415 or thesecond UE 415-a may be an example of aspects of one or more of the UEs115 described with reference to FIG. 1. In some examples, each of thefirst UE 415, the second UE 415-a, and in some examples other UEs (notshown) may be served in NOMA fashion (e.g., as a NOMA group, regardlessof whether the NOMA group is defined as such). Messages may betransmitted between the base station 405, the first UE 415, or thesecond UE 415-a over at least one radio frequency spectrum band.

As shown in FIG. 4, the base station 405 may transmit a respective UEidentifier to each of the UEs in the NOMA group. For example, the basestation 405 may transmit a first UE identifier 420 (e.g., a first RNTI)to the first UE 415 and a second UE identifier 425 (e.g., a second RNTI)to the second UE 415-a. The first UE identifier 420 may identify thefirst UE 415, and the second UE identifier 425 may identify the secondUE 415-a. In other examples, each of the UEs in the NOMA group,including the first UE 415 and the second UE 415-a, may transmit its UEidentifier to the base station 405. In some examples, the base station405 may transmit, to each of a plurality of UEs in a NOMA group, the UEidentifiers of other UEs in the NOMA group (e.g., the base station 405may transmit the second UE identifier 425 to the first UE 415 ortransmit the first UE identifier 420 to the second UE 415-a.

The base station 405 may further transmit at least one control channelelement (e.g., control channel element(s) 430) associated with the firstUE 415 to the first UE 415. In some examples, the base station 405 maytransmit a different control channel element or elements to the secondUE 415-a. In some examples, the control channel element(s) 430 may betransmitted for a subframe of wireless communications between the basestation 405 and one or more of the UEs in the NOMA group. In someexamples, the control channel element(s) 430 may be transmitted at thebeginning of a subframe. In some examples, the control channelelement(s) 430 may be transmitted in one or more PDCCHs or ePDCCHs forthe first UE 415. In some examples, the control channel element(s) 430may include downlink control information for the first UE 415. Thecontrol channel element(s) 430 may also include a copy of downlinkcontrol information for other UEs (e.g., other UEs in the NOMA group)with which the base station 405 intends to communicate with during asubframe. In some examples, the other UEs with which the base station405 intends to communicate with during a subframe may include the secondUE 415-a.

In some examples, the control channel element(s) 430 may include asingle control channel element (e.g., a single PDCCH or ePDCCH)associated with the first UE 415. The single control channel element mayinclude downlink control information for the first UE 415 and at leastthe second UE 415-a (e.g., the single control channel element mayinclude a first PDCCH or first ePDCCH for the first UE 415, and apayload of a second PDCCH or second ePDCCH for the second UE 415-a maybe duplicated in the payload of the first PDCCH or first ePDCCH). Insome examples, the control channel element(s) 430 may include a firstcontrol channel element associated with the first UE 415 and at least asecond control channel element associated with the first UE 415. Thefirst control channel element may include downlink control informationfor the first UE 415, and at least the second control channel elementmay include downlink control information for at least the second UE415-a (e.g., the first control channel element may include a first PDCCHor first ePDCCH for the first UE 415, and the second control channelelement may include a second PDCCH or second ePDCCH for the first UE,which second PDDCH or second ePDCCH for the first UE contains a copy ofa PDCCH or ePDCCH for the second UE 415-a). In some examples, thecontrol channel element(s) 430 may include the UE identifier (e.g.,RNTI) associated with each UE for which downlink control information isprovided in the control channel element(s) 430.

At block 435, the first UE 415 may decode the downlink controlinformation received in the control channel element(s) 430 and determinethe UE(s) to which the downlink control information corresponds. In someexamples, the first UE 415 may process the downlink control informationfor the first UE 415 to determine, for example, a transmission format,data rate, rank, MCS, or hybrid automatic repeat request (HARD)information for a first downlink transmission (e.g., a first PDSCHtransmission) for the first UE 415. When the first UE 415 determinesthat the downlink control information contains downlink controlinformation for the second UE 415-a or other UEs in the NOMA group, thefirst UE 415 may process the downlink control information for each ofthe UEs represented in the downlink control information.

At block 440, the first UE 415 may determine, based at least in part ondownlink control information for the first UE 415, downlink controlinformation for the second UE 415-a, or downlink control information forother UEs for which downlink control information is provided in thecontrol channel element(s) 430, whether there is an interferingtransmission (e.g., an interfering PDSCH transmission) that overlaps afirst downlink transmission (e.g., a first PDSCH transmission) for thefirst UE (e.g., whether there is a transmission that may interfere withreceipt of the first downlink transmission at the first UE 415). In someexamples, the interfering transmission may include a second downlinktransmission (e.g., a second PDSCH transmission) for the second UE415-a. In some examples, the interfering transmission may include adownlink transmission for each of a number of UEs, other than the firstUE 415, for which downlink control information is provided in thecontrol channel element(s) 430. When the first UE 415 determines thatthere is no interfering transmission, the first UE 415 may not performany further operations at blocks 450 or 455 (e.g., for a currentsubframe of wireless communications between the base station 405 and oneor more of the UEs of the NOMA group).

At some point in time following transmission of the control channelelement(s) 430 (and in some examples, immediately following), the basestation 405 may transmit a set of NOMA downlink transmissions 445. Theset of NOMA downlink transmissions 445 may be received by each of theUEs in the NOMA group, including the first UE 415 and the second UE415-a. In some examples, the set of NOMA downlink transmissions 445 maybe received at the first UE 415 based at least in part on downlinkcontrol information for the first UE 415. In some examples, the set ofNOMA downlink transmissions 445 may also be received at the first UE 415based at least in part on downlink control information for the second UE415-a or other UEs represented in downlink control information providedin the control channel element(s) 430.

At block 450, and upon determining at block 440 that there is aninterfering transmission, the first UE 415 may perform an interferencecancellation operation (e.g., a CWIC operation) on each interferingtransmission. The interference cancellation operation may be performedon an interfering transmission corresponding to a UE based at least inpart on received downlink control information for the UE. In someexamples, the interference cancellation operation may include decoding(e.g., descrambling (e.g., CRC-descrambling)) an interferingtransmission corresponding to a UE based at least in part on a UEidentifier for the UE. For example, an interfering transmissioncorresponding to the second UE 415-a may be descrambled (e.g.,CRC-descrambled) based at least in part on the second UE identifier 425(or an RNTI) associated with the second UE 415-a. In some examples, thefirst UE 415 may perform the interference cancellation operation foreach UE, other than the first UE 415, for which downlink controlinformation is provided in the control channel element(s) 430.

At block 455, the first UE 415 may identify, in the set of NOMA downlinktransmissions 445, the first downlink transmission for the first UE 415.The first downlink transmission for the first UE 415 may be identifiedusing the first UE identifier 420 (e.g., the first RNTI). In someexamples, identifying the first downlink transmission for the first UE415 may include decoding (e.g., descrambling (e.g., CRC-descrambling))the first downlink transmission for the first UE 415 based at least inpart on the first UE identifier 420.

FIG. 5 shows a block diagram 500 of an apparatus 515 for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. In some examples, the apparatus 515 may be an example ofaspects of one or more of the UEs 115, 215, or 215-a described withreference to FIG. 1 or 2. The apparatus 515 may also be a processor. Theapparatus 515 may include a receiver module 510, a wirelesscommunication management module 520, or a transmitter module 530. Eachof these components may be in communication with each other.

The components of the apparatus 515 may, individually or collectively,be implemented using one or more Application-Specific IntegratedCircuits (ASICs) adapted to perform some or all of the applicablefunctions in hardware. Alternatively, the functions may be performed byone or more other processing units (or cores), on one or more integratedcircuits. In other examples, other types of integrated circuits may beused (e.g., Structured/Platform ASICs, Field Programmable Gate Arrays(FPGAs), and other Semi-Custom ICs), which may be programmed in anymanner known in the art. The functions of each unit may also beimplemented, in whole or in part, with instructions embodied in amemory, formatted to be executed by one or more general orapplication-specific processors.

In some examples, the receiver module 510 may include at least one radiofrequency (RF) receiver, such as at least one RF receiver operable toreceive transmissions over at least one radio frequency spectrum band.In some examples, the at least one radio frequency spectrum band may beused for wireless communications, as described, for example, withreference to FIG. 1 or 2. The receiver module 510 may be used to receivevarious types of data or control signals (i.e., transmissions) over oneor more communication links of a wireless communication system, such asone or more communication links of the wireless communication system 100described with reference to FIG. 1.

In some examples, the transmitter module 530 may include at least one RFtransmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module530 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100 described with reference to FIG. 1.

The wireless communication management module 520 may be used to managesome or all of the wireless communications to or from the apparatus 515.In some examples, the wireless communication management module 520 mayinclude a downlink control information (DCI) processing module 535 or aNOMA transmission processing module 540.

In some examples, the DCI processing module 535 may be used to receivedownlink control information for a first UE (e.g., a UE including theapparatus 515) based at least in part on a group identifier associatedwith a NOMA group including the first UE and at least a second UE.

In some examples, the NOMA transmission processing module 540 may beused to receive a set of NOMA downlink transmissions at the first UEusing the decoded downlink control information for the first UE.

FIG. 6 shows a block diagram 600 of an apparatus 615 for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. In some examples, the apparatus 615 may be an example ofaspects of one or more of the UEs 115, 215, or 215-a described withreference to FIG. 1 or 2, or aspects of the apparatus 515 described withreference to FIG. 5. The apparatus 615 may also be a processor. Theapparatus 615 may include a receiver module 610, a wirelesscommunication management module 620, or a transmitter module 630. Eachof these components may be in communication with each other.

The components of the apparatus 615 may, individually or collectively,be implemented using one or more ASICs adapted to perform some or all ofthe applicable functions in hardware. Alternatively, the functions maybe performed by one or more other processing units (or cores), on one ormore integrated circuits. In other examples, other types of integratedcircuits may be used (e.g., Structured/Platform ASICs, FPGAs, and otherSemi-Custom ICs), which may be programmed in any manner known in theart. The functions of each unit may also be implemented, in whole or inpart, with instructions embodied in a memory, formatted to be executedby one or more general or application-specific processors.

In some examples, the receiver module 610 may include at least one RFreceiver, such as at least one RF receiver operable to receivetransmissions over at least one radio frequency spectrum band. In someexamples, the at least one radio frequency spectrum band may be used forwireless communications, as described, for example, with reference toFIG. 1 or 2. The receiver module 610 may be used to receive varioustypes of data or control signals (i.e., transmissions) over one or morecommunication links of a wireless communication system, such as one ormore communication links of the wireless communication system 100described with reference to FIG. 1.

In some examples, the transmitter module 630 may include at least one RFtransmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module630 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100 described with reference to FIG. 1.

The wireless communication management module 620 may be used to managesome or all of the wireless communications to or from the apparatus 615.In some examples, the wireless communication management module 620 mayinclude an identifier management module 645, a downlink controlinformation (DCI) processing module 635, an interference determinationmodule 650, a downlink transmission RNTI determination module 655, or aNOMA transmission processing module 640.

In some examples, the identifier management module 645 may be used toreceive a group identifier or a first UE identifier from a base station.The group identifier may be associated with a NOMA group including afirst UE (e.g., a UE including the apparatus 615) and at least a secondUE. The first UE identifier may identify the first UE. In some examples,the identifier management module 645 may be used to receive a range ofUE identifiers associated with the NOMA group. The range of UEidentifiers may include at least a second UE identifier. The second UEidentifier may identify the second UE. In some examples, the groupidentifier, the first UE identifier, or the range of UE identifiers maybe received from the base station during a random access procedure. Insome examples, the group identifier may include a group RNTI. In someexamples, the identifier management module 645 may be used to transmitthe first UE identifier to the base station.

In some examples, the DCI processing module 635 may be used to receivedownlink control information based at least in part on the groupidentifier received by the identifier management module 645 (e.g., theDCI processing module 635 may be used to descramble (e.g.,CRC-descramble) downlink control information using the groupidentifier). In some examples, the downlink control information mayinclude downlink control information for the first UE, downlink controlinformation for the second UE, or downlink control information for otherUEs in the NOMA group. In some examples, receiving downlink controlinformation based at least in part on the group identifier may includereceiving all downlink control information associated with the NOMAgroup based at least in part on the group identifier.

In some examples, the DCI processing module 635 may be used to receivedownlink control information for a UE based at least in part on thegroup identifier received by the identifier management module 645. Forexample, the DCI processing module 635 may decode (e.g., descramble(e.g., CRC-descramble)) the downlink control information for the firstUE using the group identifier, and decode (e.g., descramble (e.g.,CRC-descramble)) the downlink control information for the second UEusing the group identifier. In other examples, the DCI processing module635 may be used to receive downlink control information for a UE basedat least in part on a deterministic function (e.g., an XOR) of the groupidentifier and a UE identifier. For example, the DCI processing module635 may decode (e.g., descramble (e.g., CRC-descramble)) downlinkcontrol information for the first UE based at least in part on adeterministic function of the group identifier and the first UEidentifier, and decode (e.g., descramble (e.g., CRC-descramble))downlink control information for the second UE based at least in part ona deterministic function of the group identifier and the second UEidentifier.

In some examples, the DCI processing module 635 may be used to determinewhether the received downlink control information contains downlinkcontrol information for the first UE. The determination may be based atleast in part on the first UE identifier assigned to the first UE. Inexamples in which the downlink control information for a UE is scrambledusing the group identifier, the determining may be based at least inpart on whether the downlink control information references (e.g.,includes) the first UE identifier. In examples in which the downlinkcontrol information for the first UE is scrambled using a deterministicfunction of the group identifier and the first UE identifier, thedetermination may be based at least in part on an ability to decode(e.g., descramble (e.g., CRC-descramble)) the downlink controlinformation for the first UE. In some examples, the DCI processingmodule 635 may be used to determine whether the received downlinkcontrol information contains downlink control information for the secondUE. The determination may be based at least in part on the second UEidentifier assigned to the second UE. In examples in which the downlinkcontrol information for a UE is scrambled using the group identifier,the determination may be based at least in part on whether the downlinkcontrol information references (e.g., includes) the second UEidentifier. In examples in which the downlink control information forthe second UE is scrambled using a deterministic function of the groupidentifier and the second UE identifier, the determination may be basedat least in part on an ability to decode (e.g., descramble (e.g.,CRC-descramble)) the downlink control information for the second UE. Insome examples, the DCI processing module 635 may be used to determinewhether the received downlink control information contains downlinkcontrol information for each of a number of UEs (or for all of the UEs)in the NOMA group.

In some examples, the interference determination module 650 may be usedto determine, based at least in part on downlink control information forthe first UE and downlink control information for the second UE (andpossibly based on downlink control information for other UEs in the NOMAgroup), whether there is an interfering transmission that overlaps afirst downlink transmission for the first UE (e.g., whether there is atransmission that may interfere with receipt of the first downlinktransmission at the first UE). In some examples, the interferingtransmission may include a second downlink transmission for the secondUE. In some examples, the interfering transmission may include adownlink transmission for each of a number of UEs other than the firstUE in the NOMA group, or the interfering transmission may includedownlink transmissions for all of the UEs other than the first UE in theNOMA group.

In some examples, the downlink transmission RNTI determination module655 may be used to determine a first RNTI corresponding to a firstdownlink transmission for the first UE. The first RNTI may be determinedbased at least in part on the first UE identifier. In some examples, thefirst RNTI may be determined based at least in part on a deterministicfunction (e.g., an XOR) of the first UE identifier and the groupidentifier. In some examples, the downlink transmission RNTIdetermination module 655 may be used to determine a second RNTIcorresponding to a second downlink transmission for the second UE. Thesecond RNTI may be determined based at least in part on the second UEidentifier. In some examples, the second RNTI may be determined based atleast in part on a deterministic function (e.g., an XOR) of the secondUE identifier and the group identifier. In some examples, the downlinktransmission RNTI determination module 655 may be used to determine arespective RNTI for each of a number of UEs other than the first UE inthe NOMA group, or for all of the UEs other than the first UE in theNOMA group, depending, for example, on whether the downlink controlinformation received by the DCI processing module 635 contains downlinkcontrol information for a UE or depending on whether there is aninterfering transmission for the UE overlapping the first downlinktransmission for the first UE.

In some examples, the NOMA transmission processing module 640 may beused to receive a set of NOMA downlink transmissions at the first UEbased at least in part on the downlink control information for the firstUE, the downlink control information for the second UE, or the downlinkcontrol information for any other UE in the NOMA group, which second UEor other UE may receive an interfering transmission that overlaps withthe first downlink transmission for the first UE. In some examples, theNOMA transmission processing module 640 may be used to identify, in theset of NOMA downlink transmissions, the first downlink transmission forthe first UE. The first downlink transmission for the first UE may beidentified using the first RNTI. In some examples, identifying the firstdownlink transmission for the first UE may include descrambling (e.g.,CRC-descrambling) the first downlink transmission for the first UE.

In some examples, the NOMA transmission processing module 640 mayinclude an interference cancellation module 660. In some examples, theinterference cancellation module 660 may be used to perform aninterference cancellation operation on an interfering transmissionidentified by the interference determination module 650. Theinterference cancellation operation may be performed based at least inpart on the downlink control information for any UE, in the NOMA group,that receives an interfering transmission that overlaps the firstdownlink transmission for the first UE. The interference cancellationoperation may be performed using the RNTI(s) of the UE(s) receiving theinterfering transmission(s). In some examples, the interferencecancellation operation may include decoding the interferingtransmission(s) and then canceling the interfering transmission(s) fromthe set of NOMA downlink transmissions.

FIG. 7 shows a block diagram 700 of an apparatus 715 for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. In some examples, the apparatus 715 may be an example ofaspects of one or more of the UEs 115, 315, or 315-a described withreference to FIG. 1 or 3. The apparatus 715 may also be a processor. Theapparatus 715 may include a receiver module 710, a wirelesscommunication management module 720, or a transmitter module 730. Eachof these components may be in communication with each other.

The components of the apparatus 715 may, individually or collectively,be implemented using one or more ASICs adapted to perform some or all ofthe applicable functions in hardware. Alternatively, the functions maybe performed by one or more other processing units (or cores), on one ormore integrated circuits. In other examples, other types of integratedcircuits may be used (e.g., Structured/Platform ASICs, FPGAs, and otherSemi-Custom ICs), which may be programmed in any manner known in theart. The functions of each unit may also be implemented, in whole or inpart, with instructions embodied in a memory, formatted to be executedby one or more general or application-specific processors.

In some examples, the receiver module 710 may include at least one RFreceiver, such as at least one RF receiver operable to receivetransmissions over at least one radio frequency spectrum band. In someexamples, the at least one radio frequency spectrum band may be used forwireless communications, as described, for example, with reference toFIG. 1 or 3. The receiver module 710 may be used to receive varioustypes of data or control signals (i.e., transmissions) over one or morecommunication links of a wireless communication system, such as one ormore communication links of the wireless communication system 100described with reference to FIG. 1.

In some examples, the transmitter module 730 may include at least one RFtransmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module730 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100 described with reference to FIG. 1.

The wireless communication management module 720 may be used to managesome or all of the wireless communications to or from the apparatus 715.In some examples, the wireless communication management module 720 mayinclude a downlink control information (DCI) processing module 735 or aNOMA transmission processing module 750.

In some examples, the DCI processing module 735 may be used to receivedownlink control information from a base station, and may include afirst UE DCI processing module 740 or a second UE DCI processing module745. The first UE DCI processing module 740 may be used to receivedownlink control information for a first UE. The first UE may includethe apparatus 715. In some examples, the downlink information for thefirst UE may be received based at least in part on an RNTI associatedwith the first UE. The downlink control information for the first UE mayinclude an indication of at least a second UE. In some examples, theindication of at least the second UE may include an RNTI associated withthe second UE. In some examples, the indication of at least the secondUE may include an index associated with a set of other UEs that can beconfigured to operate in a NOMA group with the first UE. The set ofother UEs may include the second UE. In some examples, the first UE DCIprocessing module 740 may be used to determine an RNTI associated withthe second UE based at least in part on the index.

In some examples, the second UE DCI processing module 745 may be used toreceive downlink control information for the second UE based at least inpart on the indication of at least the second UE.

In some examples, the NOMA transmission processing module 750 may beused to receive a set of NOMA downlink transmissions at the first UEbased at least in part on the downlink control information for the firstUE and the downlink control information for the second UE.

FIG. 8 shows a block diagram 800 of an apparatus 815 for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. In some examples, the apparatus 815 may be an example ofaspects of one or more of the UEs 115, 315, or 315-a described withreference to FIG. 1 or 3, or aspects of the apparatus 715 described withreference to FIG. 7. The apparatus 815 may also be a processor. Theapparatus 815 may include a receiver module 810, a wirelesscommunication management module 820, or a transmitter module 830. Eachof these components may be in communication with each other.

The components of the apparatus 815 may, individually or collectively,be implemented using one or more ASICs adapted to perform some or all ofthe applicable functions in hardware. Alternatively, the functions maybe performed by one or more other processing units (or cores), on one ormore integrated circuits. In other examples, other types of integratedcircuits may be used (e.g., Structured/Platform ASICs, FPGAs, and otherSemi-Custom ICs), which may be programmed in any manner known in theart. The functions of each unit may also be implemented, in whole or inpart, with instructions embodied in a memory, formatted to be executedby one or more general or application-specific processors.

In some examples, the receiver module 810 may include at least one RFreceiver, such as at least one RF receiver operable to receivetransmissions over at least one radio frequency spectrum band. In someexamples, the at least one radio frequency spectrum band may be used forwireless communications, as described, for example, with reference toFIG. 1 or 3. The receiver module 810 may be used to receive varioustypes of data or control signals (i.e., transmissions) over one or morecommunication links of a wireless communication system, such as one ormore communication links of the wireless communication system 100described with reference to FIG. 1.

In some examples, the transmitter module 830 may include at least one RFtransmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module830 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100 described with reference to FIG. 1.

The wireless communication management module 820 may be used to managesome or all of the wireless communications to or from the apparatus 815.In some examples, the wireless communication management module 820 mayinclude an identifier management module 855, a downlink controlinformation (DCI) processing module 835, an interference determinationmodule 860, or a NOMA transmission processing module 850.

In some examples, the identifier management module 855 may be used toreceive a first UE identifier from a base station. In some examples, theidentifier management module 855 may be used to transmit the first UEidentifier to the base station. The first UE identifier may identify thefirst UE, and in some examples may include an RNTI associated with thefirst UE. In some examples, the first UE may include the apparatus 815.

In some examples, the DCI processing module 835 may be used to receivedownlink control information from a base station, and may include afirst UE DCI processing module 840 or a second UE DCI processing module845. The first UE DCI processing module 840 may be used to receivedownlink control information for a first UE. The first UE may includethe apparatus 815. In some examples, the downlink information for thefirst UE may be received based at least in part on an RNTI associatedwith the first UE. The downlink control information for the first UE mayinclude an indication of at least a second UE. In some examples, theindication of at least the second UE may include an RNTI associated withthe second UE. In some examples, the indication of at least the secondUE may include an index associated with a set of other UEs that can beconfigured to operate in a NOMA group with the first UE. The set ofother UEs may include the second UE. In some examples, the first UE DCIprocessing module 840 may be used to determine an RNTI associated withthe second UE based at least in part on the index.

In some examples, the second UE DCI processing module 845 may be used toreceive downlink control information for the second UE based at least inpart on the indication of at least the second UE. In some examples, theindication of at least the second UE may include an indication of thesecond UE, and receiving the downlink control information for the secondUE may include decoding (e.g., descrambling (e.g., CRC-scrambling)) thedownlink control information for the second UE based at least in part onthe indication of the second UE.

In some examples, the interference determination module 860 may be usedto determine, based at least in part on downlink control information forthe first UE and downlink control information for the second UE (andpossibly based on downlink control information for other UEs in a NOMAgroup), whether there is an interfering transmission that overlaps afirst downlink transmission for the first UE (e.g., whether there is atransmission that may interfere with receipt of the first downlinktransmission at the first UE). In some examples, the interferingtransmission may include a second downlink transmission for the secondUE. In some examples, the interfering transmission may include adownlink transmission for each of a number of UEs other than the firstUE in the NOMA group, or the interfering transmission may includedownlink transmissions for all of the UEs other than the first UE in theNOMA group.

In some examples, the NOMA transmission processing module 850 may beused to receive a set of NOMA downlink transmissions at the first UEbased at least in part on the downlink control information for the firstUE and the downlink control information for the second UE, or thedownlink control information for any other UE in a NOMA group, whichsecond UE or other UE may receive an interfering transmission thatoverlaps with the first downlink transmission for the first UE. In someexamples, the NOMA transmission processing module 850 may be used toidentify, in the set of NOMA downlink transmissions, the first downlinktransmission for the first UE. The first downlink transmission for thefirst UE may be identified using a first RNTI for the first UE. In someexamples, identifying the first downlink transmission for the first UEmay include descrambling (e.g., CRC-descrambling) the first downlinktransmission for the first UE.

In some examples, the NOMA transmission processing module 850 mayinclude an interference cancellation module 865. In some examples, theinterference cancellation module 865 may be used to perform aninterference cancellation operation on an interfering transmissionidentified by the interference determination module 860. Theinterference cancellation operation may be performed based at least inpart on the downlink control information for any UE, in a NOMA group,that receives an interfering transmission that overlaps the firstdownlink transmission for the first UE. The interference cancellationoperation may be performed using the RNTI(s) associated with each UEreceiving the interfering transmission(s). In some examples, theinterference cancellation operation may include decoding the interferingtransmission(s) and then canceling the interfering transmission(s) fromthe set of NOMA downlink transmissions.

FIG. 9 shows a block diagram 900 of an apparatus 915 for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. In some examples, the apparatus 915 may be an example ofaspects of one or more of the UEs 115, 415, or 415-a described withreference to FIG. 1 or 4. The apparatus 915 may also be a processor. Theapparatus 915 may include a receiver module 910, a wirelesscommunication management module 920, or a transmitter module 930. Eachof these components may be in communication with each other.

The components of the apparatus 915 may, individually or collectively,be implemented using one or more ASICs adapted to perform some or all ofthe applicable functions in hardware. Alternatively, the functions maybe performed by one or more other processing units (or cores), on one ormore integrated circuits. In other examples, other types of integratedcircuits may be used (e.g., Structured/Platform ASICs, FPGAs, and otherSemi-Custom ICs), which may be programmed in any manner known in theart. The functions of each unit may also be implemented, in whole or inpart, with instructions embodied in a memory, formatted to be executedby one or more general or application-specific processors.

In some examples, the receiver module 910 may include at least one RFreceiver, such as at least one RF receiver operable to receivetransmissions over at least one radio frequency spectrum band. In someexamples, the at least one radio frequency spectrum band may be used forwireless communications, as described, for example, with reference toFIG. 1 or 4. The receiver module 910 may be used to receive varioustypes of data or control signals (i.e., transmissions) over one or morecommunication links of a wireless communication system, such as one ormore communication links of the wireless communication system 100described with reference to FIG. 1.

In some examples, the transmitter module 930 may include at least one RFtransmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module930 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100 described with reference to FIG. 1.

The wireless communication management module 920 may be used to managesome or all of the wireless communications to or from the apparatus 915.In some examples, the wireless communication management module 920 mayinclude a control channel processing module 935 or a NOMA transmissionprocessing module 940.

In some examples, the control channel processing module 935 may be usedto receive, at a first UE (e.g., a UE including the apparatus 915), atleast one control channel element associated with the first UE. The atleast one control channel element may include downlink controlinformation for the first UE and at least a second UE.

In some examples, the NOMA transmission processing module 940 may beused to receive a set of NOMA downlink transmissions at the first UEbased at least in part on the downlink control information for the firstUE and at least the second UE.

FIG. 10 shows a block diagram 1000 of an apparatus 1015 for use inwireless communication, in accordance with various aspects of thepresent disclosure. In some examples, the apparatus 1015 may be anexample of aspects of one or more of the UEs 115, 415, or 415-adescribed with reference to FIG. 1 or 4, or aspects of the apparatus 915described with reference to FIG. 9. The apparatus 1015 may also be aprocessor. The apparatus 1015 may include a receiver module 1010, awireless communication management module 1020, or a transmitter module1030. Each of these components may be in communication with each other.

The components of the apparatus 1015 may, individually or collectively,be implemented using one or more ASICs adapted to perform some or all ofthe applicable functions in hardware. Alternatively, the functions maybe performed by one or more other processing units (or cores), on one ormore integrated circuits. In other examples, other types of integratedcircuits may be used (e.g., Structured/Platform ASICs, FPGAs, and otherSemi-Custom ICs), which may be programmed in any manner known in theart. The functions of each unit may also be implemented, in whole or inpart, with instructions embodied in a memory, formatted to be executedby one or more general or application-specific processors.

In some examples, the receiver module 1010 may include at least one RFreceiver, such as at least one RF receiver operable to receivetransmissions over at least one radio frequency spectrum band. In someexamples, the at least one radio frequency spectrum band may be used forwireless communications, as described, for example, with reference toFIG. 1 or 4. The receiver module 1010 may be used to receive varioustypes of data or control signals (i.e., transmissions) over one or morecommunication links of a wireless communication system, such as one ormore communication links of the wireless communication system 100described with reference to FIG. 1.

In some examples, the transmitter module 1030 may include at least oneRF transmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module1030 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100 described with reference to FIG. 1.

The wireless communication management module 1020 may be used to managesome or all of the wireless communications to or from the apparatus1015. In some examples, the wireless communication management module1020 may include an identifier management module 1045, a control channelprocessing module 1035, an interference determination module 1050, or aNOMA transmission processing module 1040.

In some examples, the identifier management module 1045 may be used toreceive a first UE identifier from a base station. In some examples, theidentifier management module 1045 may be used to transmit the first UEidentifier to the base station. The first UE identifier may identify thefirst UE, and in some examples may include an RNTI associated with thefirst UE. In some examples, the first UE may include the apparatus 1015.In some examples, the identifier management module 1045 may also be usedto receive or transmit UE identifiers associated with other UEs (e.g.,UE identifiers associated with other UEs assigned to a NOMA group withthe first UE).

In some examples, the control channel processing module 1035 may be usedto receive, at a first UE, at least one control channel elementassociated with the first UE. The at least one control channel elementmay include downlink control information for the first UE and at least asecond UE. In some examples, the control channel processing module 1035may receive a single control channel element associated with the firstUE. The single control channel element may include the downlink controlinformation for the first UE and at least the second UE. In someexamples, the control channel processing module 1035 may receive a firstcontrol channel element associated with the first UE and at least asecond control channel element associated with the first UE. The firstcontrol channel element may include the downlink control information forthe first UE, and at least the second control channel element mayinclude the downlink control information for at least the second UE.

In some examples, the interference determination module 1050 may be usedto determine, based at least in part on downlink control information forthe first UE and downlink control information for the second UE (andpossibly based on downlink control information for other UEs in a NOMAgroup), whether there is an interfering transmission that overlaps afirst downlink transmission for the first UE (e.g., whether there is atransmission that may interfere with receipt of the first downlinktransmission at the first UE). In some examples, the interferingtransmission may include a second downlink transmission for the secondUE. In some examples, the interfering transmission may include adownlink transmission for each of a number of UEs other than the firstUE in the NOMA group, or the interfering transmission may includedownlink transmissions for all of the UEs other than the first UE in theNOMA group.

In some examples, the NOMA transmission processing module 1040 may beused to receive a set of NOMA downlink transmissions at the first UEbased at least in part on the downlink control information for the firstUE and the downlink control information for the second UE, or thedownlink control information for any other UE in a NOMA group, whichsecond UE or other UE may receive an interfering transmission thatoverlaps with the first downlink transmission for the first UE. In someexamples, the NOMA transmission processing module 1040 may be used toidentify, in the set of NOMA downlink transmissions, the first downlinktransmission for the first UE. The first downlink transmission for thefirst UE may be identified using the first UE identifier (e.g., thefirst RNTI) for the first UE. In some examples, identifying the firstdownlink transmission for the first UE may include descrambling (e.g.,CRC-descrambling) the first downlink transmission for the first UE.

In some examples, the NOMA transmission processing module 1040 mayinclude an interference cancellation module 1055. In some examples, theinterference cancellation module 1055 may be used to perform aninterference cancellation operation on an interfering transmissionidentified by the interference determination module 1050. Theinterference cancellation operation may be performed based at least inpart on the downlink control information for any UE, in a NOMA group,that receives an interfering transmission that overlaps the firstdownlink transmission for the first UE. The interference cancellationoperation may be performed using the RNTI(s) associated with each UEreceiving the interfering transmission(s). In some examples, theinterference cancellation operation may include decoding the interferingtransmission(s) and then canceling the interfering transmission(s) fromthe set of NOMA downlink transmissions.

FIG. 11 shows a block diagram 1100 of a UE 1115 for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. The UE 1115 may have various configurations and may beincluded or be part of a personal computer (e.g., a laptop computer, anetbook computer, a tablet computer, etc.), a cellular telephone, a PDA,a digital video recorder (DVR), an internet appliance, a gaming console,an e-reader, etc. The UE 1115 may, in some examples, have an internalpower supply (not shown), such as a small battery, to facilitate mobileoperation. In some examples, the UE 1115 may be an example of aspects ofone or more of the UEs 115, 215, 215-a, 315, or 415 described withreference to FIG. 1, 2, 3, or 4, or aspects of one or more of theapparatuses 515, 615, 715, 815, 915, or 1015 described with reference toFIG. 5, 6, 7, 8, 9, or 10. The UE 1115 may be configured to implement atleast some of the UE or apparatus features and functions described withreference to FIG. 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10.

The UE 1115 may include a UE processor module 1110, a UE memory module1120, at least one UE transceiver module (represented by UE transceivermodule(s) 1130), at least one UE antenna (represented by UE antenna(s)1140), or a UE wireless communication management module 1160. Each ofthese components may be in communication with each other, directly orindirectly, over one or more buses 1135.

The UE memory module 1120 may include random access memory (RAM) orread-only memory (ROM). The UE memory module 1120 may storecomputer-readable, computer-executable code 1125 containing instructionsthat are configured to, when executed, cause the UE processor module1110 to perform various functions described herein related to wirelesscommunication or communication using NOMA communication techniques.Alternatively, the code 1125 may not be directly executable by the UEprocessor module 1110 but be configured to cause the UE 1115 (e.g., whencompiled and executed) to perform various of the functions describedherein.

The UE processor module 1110 may include an intelligent hardware device(e.g., a central processing unit (CPU), a microcontroller, an ASIC,etc.). The UE processor module 1110 may process information receivedthrough the UE transceiver module(s) 1130 or information to be sent tothe UE transceiver module(s) 1130 for transmission through the UEantenna(s) 1140. The UE processor module 1110 may handle, alone or inconnection with the UE wireless communication management module 1160,various aspects of wireless communication for the UE 1115.

The UE transceiver module(s) 1130 may include a modem configured tomodulate packets and provide the modulated packets to the UE antenna(s)1140 for transmission, and to demodulate packets received from the UEantenna(s) 1140. The UE transceiver module(s) 1130 may, in someexamples, be implemented as one or more UE transmitter modules and oneor more separate UE receiver modules. The UE transceiver module(s) 1130may support communications in the first radio frequency spectrum band orthe second radio frequency spectrum band. The UE transceiver module(s)1130 may be configured to communicate bi-directionally, via the UEantenna(s) 1140, with one or more of the base stations 105, 205, 305 or405 described with reference to FIG. 1, 2, 3, or 4. While the UE 1115may include a single UE antenna, there may be examples in which the UE1115 may include multiple UE antennas 1140.

The UE state module 1150 may be used, for example, to manage transitionsof the UE 1115 between an RRC idle state and an RRC connected state, andmay be in communication with other components of the UE 1115, directlyor indirectly, over the one or more buses 1135. The UE state module1150, or portions of it, may include a processor, or some or all of thefunctions of the UE state module 1150 may be performed by the UEprocessor module 1110 or in connection with the UE processor module1110.

The UE wireless communication management module 1160 may be configuredto perform or control some or all of the features or functions describedwith reference to FIG. 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 related towireless communication, including some or all of the features orfunctions related to NOMA communication techniques for a UE. The UEwireless communication management module 1160, or portions of it, mayinclude a processor, or some or all of the functions of the UE wirelesscommunication management module 1160 may be performed by the UEprocessor module 1110 or in connection with the UE processor module1110. In some examples, the UE wireless communication management module1160 may be an example of the wireless communication management module520, 620, 720, 820, 920, or 1020 described with reference to FIG. 5, 6,7, 8, 9, or 10.

FIG. 12 shows a block diagram 1200 of a base station 1205 (e.g., a basestation forming part or all of an eNB) for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. In some examples, the base station 1205 may be an example ofaspects of one or more of the base stations 105, 205, 305, or 405described with reference to FIG. 1, 2, 3, or 4. The base station 1205may be configured to implement or facilitate at least some of the basestation or device features and functions described with reference toFIG. 1, 2, 3, or 4.

The base station 1205 may include a base station processor module 1210,a base station memory module 1220, at least one base station transceivermodule (represented by base station transceiver module(s) 1250), atleast one base station antenna (represented by base station antenna(s)1255), or a base station wireless communication management module 1260.The base station 1205 may also include one or more of a base stationcommunications module 1230 or a network communications module 1240. Eachof these components may be in communication with each other, directly orindirectly, over one or more buses 1235.

The base station memory module 1220 may include RAM or ROM. The basestation memory module 1220 may store computer-readable,computer-executable code 1225 containing instructions that areconfigured to, when executed, cause the base station processor module1210 to perform various functions described herein related to wirelesscommunication or communication using NOMA communication techniques.Alternatively, the code 1225 may not be directly executable by the basestation processor module 1210 but be configured to cause the basestation 1205 (e.g., when compiled and executed) to perform various ofthe functions described herein.

The base station processor module 1210 may include an intelligenthardware device (e.g., a CPU, a microcontroller, an ASIC, etc.). Thebase station processor module 1210 may process information receivedthrough the base station transceiver module(s) 1250, the base stationcommunications module 1230, or the network communications module 1240.The base station processor module 1210 may also process information tobe sent to the transceiver module(s) 1250 for transmission through theantenna(s) 1255, to the base station communications module 1230, fortransmission to one or more other base stations 105-d and 105-e, or tothe network communications module 1240 for transmission to a corenetwork 1245, which may be an example of one or more aspects of the corenetwork 130 described with reference to FIG. 1. The base stationprocessor module 1210 may handle, alone or in connection with the basestation wireless communication management module 1260, various aspectsof wireless communication for the base station 1205.

The base station transceiver module(s) 1250 may include a modemconfigured to modulate packets and provide the modulated packets to thebase station antenna(s) 1255 for transmission, and to demodulate packetsreceived from the base station antenna(s) 1255. The base stationtransceiver module(s) 1250 may, in some examples, be implemented as oneor more base station transmitter modules and one or more separate basestation receiver modules. The base station transceiver module(s) 1250may support communications in the one or more radio frequency spectrumbands. The base station transceiver module(s) 1250 may be configured tocommunicate bi-directionally, via the antenna(s) 1255, with one or moreUEs or apparatuses, such as one or more of the UEs 115, 215, 215-a, 315,or 415 described with reference to FIG. 1, 2, 3, or 4, or one or more ofthe apparatuses 515, 615, 715, 815, 915, or 1015 described withreference to FIG. 5, 6, 7, 8, 9, or 10. The base station 1205 may, forexample, include multiple base station antennas 1255 (e.g., an antennaarray). The base station 1205 may communicate with the core network 1245through the network communications module 1240. The base station 1205may also communicate with other base stations, such as the base stations1205-a and 1205-b, using the base station communications module 1230.

The base station wireless communication management module 1260 may beconfigured to perform or control some or all of the features orfunctions described with reference to FIG. 1, 2, 3, or 4 related towireless communication, including some or all of the features orfunctions related to NOMA communication techniques for a base station.The base station wireless communication management module 1260, orportions of it, may include a processor, or some or all of the functionsof the base station wireless communication management module 1260 may beperformed by the base station processor module 1210 or in connectionwith the base station processor module 1210.

FIG. 13 is a block diagram of a multiple input/multiple output (MIMO)communication system 1300 including a base station 1305 and a UE 1315,in accordance with various aspects of the present disclosure. The MIMOcommunication system 1300 may illustrate aspects of the wirelesscommunication system 100 described with reference to FIG. 1. In someexamples, the base station 1305 may be an example of aspects of one ormore of the base stations 105, 205, 305, 405, or 1205 described withreference to FIG. 1, 2, 3, 4, or 12. In some examples, the UE 1315 maybe an example of aspects of one or more of the UEs 115, 215, 215-a, 315,415, or 1115 described with reference to FIG. 1, 2, 3, 4, or 11, oraspects of one or more of the apparatuses 515, 615, 715, 815, 915, or1015 described with reference to FIG. 5, 6, 7, 8, 9, or 10. The basestation 1305 may be equipped with antennas 1334 through 1335, and the UE1315 may be equipped with antennas 1352 through 1353. In the MIMOcommunication system 1300, the base station 1305 may be able to senddata over multiple communication links at the same time. Eachcommunication link may be called a “layer” and the “rank” of thecommunication link may indicate the number of layers used forcommunication. For example, in a 2x2 MIMO communications system wherebase station 1305 transmits two “layers,” the rank of the communicationlink between the base station 1305 and the UE 1315 is two.

At the base station 1305, a transmit processor 1320 may receive datafrom a data source. The transmit processor 1320 may process the data.The transmit processor 1320 may also generate control symbols orreference symbols. A transmit (TX) MIMO processor 1330 may performspatial processing (e.g., precoding) on data symbols, control symbols,or reference symbols, if applicable, and may provide output symbolstreams to the transmit modulators 1332 through 1333. Each modulator1332 through 1333 may process a respective output symbol stream (e.g.,for OFDM, etc.) to obtain an output sample stream. Each modulator 1332through 1333 may further process (e.g., convert to analog, amplify,filter, and up-convert) the output sample stream to obtain a DL signal.In one example, DL signals from modulators 1332 through 1333 may betransmitted via the antennas 1334 through 1335, respectively.

At the UE 1315, the UE antennas 1352 through 1353 may receive the DLsignals from the base station 1305 and may provide the received signalsto the demodulators 1354 through 1355, respectively. Each demodulator1354 through 1355 may condition (e.g., filter, amplify, down-convert,and digitize) a respective received signal to obtain input samples. Eachdemodulator 1354 through 1355 may further process the input samples(e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 1356may obtain received symbols from all the demodulators 1354 through 1355,perform MIMO detection on the received symbols, if applicable, andprovide detected symbols. A receive processor 1358 may process (e.g.,demodulate, de-interleave, and decode) the detected symbols, providingdecoded data for the UE 1315 to a data output, and provide decodedcontrol information to a processor 1380, or memory 1382.

The processor 1380 may in some cases execute stored instructions toinstantiate a wireless communication management module 1384. Thewireless communication management module 1384 may be an example ofaspects of the wireless communication management module 520, 620, 720,820, 920, 1020, or 1160 described with reference to FIG. 5, 6, 7, 8 9,10, or 11.

On the uplink (UL), at the UE 1315, a transmit processor 1364 mayreceive and process data from a data source. The transmit processor 1364may also generate reference symbols for a reference signal. The symbolsfrom the transmit processor 1364 may be pre-coded by a transmit MIMOprocessor 1366 if applicable, further processed by the modulators 1354through 1355 (e.g., for SC-FDMA, etc.), and be transmitted to the basestation 1305 in accordance with the transmission parameters receivedfrom the base station 1305. At the base station 1305, the UL signalsfrom the UE 1315 may be received by the antennas 1334 through 1335,processed by the demodulators 1332 through 1333, detected by a MIMOdetector 1336 if applicable, and further processed by a receiveprocessor 1338. The receive processor 1338 may provide decoded data to adata output and to the processor 1340 or memory 1342. The processor 1340may in some cases execute stored instructions to instantiate a wirelesscommunication management module 1386. The wireless communicationmanagement module 1386 may be an example of aspects of the wirelesscommunication management module 1260 described with reference to FIG.12.

The components of the UE 1315 may, individually or collectively, beimplemented with one or more ASICs adapted to perform some or all of theapplicable functions in hardware. Each of the noted modules may be ameans for performing one or more functions related to operation of theMIMO communication system 1300. Similarly, the components of the basestation 1305 may, individually or collectively, be implemented with oneor more ASICs adapted to perform some or all of the applicable functionsin hardware. Each of the noted components may be a means for performingone or more functions related to operation of the MIMO communicationsystem 1300.

FIG. 14 is a flow chart illustrating an example of a method 1400 forwireless communication, in accordance with various aspects of thepresent disclosure. For clarity, the method 1400 is described below withreference to aspects of one or more of the UEs 115, 215, 215-a, 1115, or1315 described with reference to FIG. 1, 2, 11, or 13, or aspects of oneor more of the apparatuses 515 or 615 described with reference to FIG. 5or 6. In some examples, a UE or apparatus may execute one or more setsof codes to control the functional elements of the UE or apparatus toperform the functions described below. Additionally or alternatively,the UE or apparatus may perform one or more of the functions describedbelow using special-purpose hardware.

At block 1405, the method 1400 may include receiving downlink controlinformation for a first UE based at least in part on a group identifierassociated with a NOMA group including the first UE and at least asecond UE. The operation(s) at block 1405 may be performed using thewireless communication management module 520, 620, 1160, or 1384described with reference to FIG. 5, 6, 11, or 13, or the DCI processingmodule 535 or 635 described with reference to FIG. 5 or 6.

At block 1410, the method 1400 may include receiving a set of NOMAdownlink transmissions at the first UE using the downlink controlinformation for the first UE. The operation(s) at block 1410 may beperformed using the wireless communication management module 520, 620,1160, or 1384 described with reference to FIG. 5, 6, 11, or 13, or theNOMA transmission processing module 540 or 640 described with referenceto FIG. 5 or 6.

Thus, the method 1400 may provide for wireless communication. It shouldbe noted that the method 1400 is just one implementation and that theoperations of the method 1400 may be rearranged or otherwise modifiedsuch that other implementations are possible.

FIG. 15 is a flow chart illustrating an example of a method 1500 forwireless communication, in accordance with various aspects of thepresent disclosure. For clarity, the method 1500 is described below withreference to aspects of one or more of the UEs 115, 215, 215-a, 1115, or1315 described with reference to FIG. 1, 2, 11, or 13, or aspects of oneor more of the apparatuses 515 or 615 described with reference to FIG. 5or 6. In some examples, a UE or apparatus may execute one or more setsof codes to control the functional elements of the UE or apparatus toperform the functions described below. Additionally or alternatively,the UE or apparatus may perform one or more of the functions describedbelow using special-purpose hardware.

At block 1505, the method 1500 may include receiving a group identifieror a first UE identifier from a base station. The group identifier maybe associated with a NOMA group including a first UE and at least asecond UE. The first UE identifier may identify the first UE. In someexamples, the operation(s) at block 1505 may further include receiving arange of UE identifiers associated with the NOMA group. The range of UEidentifiers may include at least a second UE identifier. The second UEidentifier may identify the second UE. In some examples, the groupidentifier, the first UE identifier, or the range of UE identifiers maybe received from the base station during a random access procedure. Insome examples, the group identifier may include a group RNTI. In someexamples, the operation(s) at block 1505 may include transmitting thefirst UE identifier to the base station. The operation(s) at block 1505may be performed using the wireless communication management module 520,620, 1160, or 1384 described with reference to FIG. 5, 6, 11, or 13, orthe identifier management module 645 described with reference to FIG. 6.

At block 1510, the method 1500 may include receiving downlink controlinformation based at least in part on the group identifier received atblock 1505 (e.g., the method 1500 may include descrambling (e.g.,CRC-descrambling) downlink control information using the groupidentifier). In some examples, the downlink control information mayinclude downlink control information for the first UE, downlink controlinformation for the second UE, or downlink control information for otherUEs in the NOMA group. In some examples, receiving downlink controlinformation based at least in part on the group identifier may includereceiving all downlink control information associated with the NOMAgroup based at least in part on the group identifier.

In some examples of the method 1500, the downlink control informationreceived for a UE may be received based at least in part on the groupidentifier. For example, the downlink control information for the firstUE may be decoded (e.g., descrambled (e.g., CRC-descrambled)) using thegroup identifier, and the downlink control information for the second UEmay be decoded (e.g., descrambled (e.g., CRC-descrambled)) using thegroup identifier. In other examples of the method 1500, the downlinkcontrol information received for a UE may be received based at least inpart on a deterministic function (e.g., an XOR) of the group identifierand a UE identifier. For example, the downlink control information forthe first UE may be decoded (e.g., descrambled (e.g., CRC-descrambled))based at least in part on a deterministic function of the groupidentifier and the first UE identifier, and the downlink controlinformation for the second UE may be decoded (e.g., descrambled (e.g.,CRC-descrambled)) based at least in part on a deterministic function ofthe group identifier and the second UE identifier.

At block 1515, the method 1500 may include determining whether thedownlink control information contains downlink control information forthe first UE. The determination may be based at least in part on thefirst UE identifier assigned to the first UE. In examples in which thedownlink control information for a UE is scrambled using the groupidentifier, the determination may be based at least in part on whetherthe downlink control information references (e.g., includes) the firstUE identifier. In examples in which the downlink control information forthe first UE is scrambled using a deterministic function of the groupidentifier and the first UE identifier, the determination may be basedat least in part on an ability to decode (e.g., descramble (e.g.,CRC-descramble)) the downlink control information for the first UE. Uponnot identifying downlink control information for the first UE, themethod 1500 may continue at block 1520. Upon identifying downlinkcontrol information for the first UE, the method 1500 may continue atblock 1525.

At block 1520, the method 1500 may include monitoring for a nexttransmission of downlink control information.

The operation(s) at block 1510, 1515, or 1520 may be performed using thewireless communication management module 520, 620, 1160, or 1384described with reference to FIG. 5, 6, 11, or 13, or the DCI processingmodule 535 or 635 described with reference to FIG. 5 or 6.

At block 1525, the method 1500 may include determining a first RNTIcorresponding to a first downlink transmission for the first UE. Thefirst RNTI may be determined based at least in part on the first UEidentifier. In some examples, the first RNTI may be determined based atleast in part on a deterministic function (e.g., an XOR) of the first UEidentifier and the group identifier. The operation(s) at block 1525 maybe performed using the wireless communication management module 520,620, 1160, or 1384 described with reference to FIG. 5, 6, 11, or 13, orthe downlink transmission RNTI determination module 655 described withreference to FIG. 6.

At block 1530, the method 1500 may include determining whether thedownlink control information contains downlink control information forthe second UE. The determination may be based at least in part on asecond UE identifier assigned to the second UE. In examples in which thedownlink control information for a UE is scrambled using the groupidentifier, the determination may be based at least in part on whetherthe downlink control information references (e.g., includes) the secondUE identifier. In examples in which the downlink control information forthe second UE is scrambled using a deterministic function of the groupidentifier and the second UE identifier, the determination may be basedat least in part on an ability to decode (e.g., descramble (e.g.,CRC-descramble)) the downlink control information for the second UE.Upon not identifying downlink control information for the second UE, themethod 1500 may continue at block 1540. Upon identifying downlinkcontrol information for the second UE, the method 1500 may continue atblock 1545. The operation(s) at block 1530 may be performed using thewireless communication management module 520, 620, 1160, or 1384described with reference to FIG. 5, 6, 11, or 13, or the DCI processingmodule 535 or 635 described with reference to FIG. 5 or 6. In someexamples, the operation(s) at block 1530 may be performed for at leastthe second UE (e.g., the operation(s) may be performed for each of anumber of UEs other than the first UE in the NOMA group, or for all ofthe UEs other than the first UE in the NOMA group).

At block 1535, the method 1500 may include determining, based at leastin part on the downlink control information for the first UE and thedownlink control information for the second UE (and possibly based ondownlink control information for other UEs in the NOMA group), whetherthere is an interfering transmission that overlaps a first downlinktransmission for the first UE (e.g., whether there is a transmissionthat may interfere with receipt of the first downlink transmission atthe first UE). In some examples, the interfering transmission mayinclude a second downlink transmission for the second UE. In someexamples, the interfering transmission may include a downlinktransmission for each of a number of UEs other than the first UE in theNOMA group, or the interfering transmission may include downlinktransmissions for all of the UEs other than the first UE in the NOMAgroup. Upon determining that there is not an interfering transmission,the method 1500 may continue at block 1540. Upon determining that thereis an interfering transmission, the method 1500 may continue at block1550. The operation(s) at block 1535 may be performed using the wirelesscommunication management module 520, 620, 1160, or 1384 described withreference to FIG. 5, 6, 11, or 13, or the interference determinationmodule 650 described with reference to FIG. 6.

At block 1540, the method 1500 may include receiving a set of NOMAdownlink transmissions at the first UE based at least in part on thedownlink control information for the first UE. At block 1545, the method1500 may include identifying, in the set of NOMA downlink transmissions,the first downlink transmission for the first UE. The first downlinktransmission for the first UE may be identified using the first RNTI. Insome examples, identifying the first downlink transmission for the firstUE may include descrambling (e.g., CRC-descrambling) the first downlinktransmission for the first UE. In some examples, the identifyingoperation(s) performed at block 1545 may be performed as part of thereceiving operation(s) performed at block 1540. The operation(s) atblock 1540 or 1545 may be performed using the wireless communicationmanagement module 520, 620, 1160, or 1384 described with reference toFIG. 5, 6, 11, or 13, or the NOMA transmission processing module 540 or640 described with reference to FIG. 5 or 6.

At block 1550, the method 1500 may include determining a second RNTIcorresponding to a second downlink transmission for the second UE. Thesecond RNTI may be determined based at least in part on the second UEidentifier. In some examples, the second RNTI may be determined based atleast in part on a deterministic function (e.g., an XOR) of the secondUE identifier and the group identifier. The operation(s) at block 1550may be performed using the wireless communication management module 520,620, 1160, or 1384 described with reference to FIG. 5, 6, 11, or 13, orthe downlink transmission RNTI determination module 655 described withreference to FIG. 6. In some examples, the operation(s) at block 1550may be performed for at least the second UE (e.g., the operation(s) maybe performed for each of a number of UEs other than the first UE in theNOMA group, or for all of the UEs other than the first UE in the NOMAgroup, depending, for example, on whether the downlink controlinformation received at block 1510 contains downlink control informationfor a UE or depending on whether there is an interfering transmissionfor the UE overlapping the first downlink transmission for the firstUE).

At block 1555, the method 1500 may include receiving a set of NOMAdownlink transmissions at the first UE based at least in part on thedownlink control information for the first UE and the downlink controlinformation for the second UE (and in some examples, downlink controlinformation for each of a number of UEs other than the first UE in theNOMA group, depending on the determination(s) made at block 1530 or1535). The operation(s) at block 1555 may be performed using thewireless communication management module 520, 620, 1160, or 1384described with reference to FIG. 5, 6, 11, or 13, or the NOMAtransmission processing module 540 or 640 described with reference toFIG. 5 or 6.

At block 1560, the method 1500 may include performing an interferencecancellation operation on the interfering transmission(s) identified atblock 1535. The interference cancellation operation may be performedbased at least in part on the downlink control information for thesecond UE. The interference cancellation operation may also be performedusing the second RNTI. In some examples the interference cancellationoperation may be performed based at least in part on the downlinkcontrol information for each of a number of UEs other than the first UEin the NOMA group, depending on the determinations(s) made at block 1530or 1535. The interference cancellation operation may also be performedusing RNTIs for each of the number of UEs other than the first UE. Insome examples, the interference cancellation operation may includedecoding the interfering transmission(s) and then canceling theinterfering transmission(s) from the set of NOMA downlink transmissions.The operation(s) at block 1560 may be performed using the wirelesscommunication management module 520, 620, 1160, or 1384 described withreference to FIG. 5, 6, 11, or 13, or the interference cancellationmodule 660 described with reference to FIG. 6.

At block 1565, the method 1500 may include identifying, in the set ofNOMA downlink transmissions, the first downlink transmission for thefirst UE. The first downlink transmission for the first UE may beidentified using the first RNTI. In some examples, identifying the firstdownlink transmission for the first UE may include descrambling (e.g.,CRC-descrambling) the first downlink transmission for the first UE. Insome examples, the identifying operation(s) performed at block 1545 maybe performed as part of the receiving operation(s) performed at block1540. The operation(s) at block 1540 or 1545 may be performed using thewireless communication management module 520, 620, 1160, or 1384described with reference to FIG. 5, 6, 11, or 13, or the NOMAtransmission processing module 540 or 640 described with reference toFIG. 5 or 6.

Thus, the method 1500 may provide for wireless communication. It shouldbe noted that the method 1500 is just one implementation and that theoperations of the method 1500 may be rearranged or otherwise modifiedsuch that other implementations are possible.

FIG. 16 is a flow chart illustrating an example of a method 1600 forwireless communication, in accordance with various aspects of thepresent disclosure. For clarity, the method 1600 is described below withreference to aspects of one or more of the UEs 115, 315, 315-a, 1115, or1315 described with reference to FIG. 1, 3, 11, or 13, or aspects of oneor more of the apparatuses 715 or 815 described with reference to FIG. 7or 8. In some examples, a UE or apparatus may execute one or more setsof codes to control the functional elements of the UE or apparatus toperform the functions described below. Additionally or alternatively,the UE or apparatus may perform one or more of the functions describedbelow using special-purpose hardware.

At block 1605, the method 1600 may include receiving downlink controlinformation for a first UE. In some examples, the downlink informationfor the first UE may be received based at least in part on an RNTIassociated with the first UE. The downlink control information for thefirst UE may include an indication of at least a second UE. In someexamples, the indication of at least the second UE may include an RNTIassociated with the second UE. In some examples, the indication of atleast the second UE may include an index associated with a set of otherUEs that can be configured to operate in a NOMA group with the first UE.The set of other UEs may include the second UE. In some examples, themethod 1600 may include determining an RNTI associated with the secondUE based at least in part on the index. The operation(s) at block 1605may be performed using the wireless communication management module 720,820, 1160, or 1384 described with reference to FIG. 7, 8, 11, or 13, orthe DCI processing module 735 or 835 or the first UE DCI processingmodule 740 or 840 described with reference to FIG. 7 or 8.

At block 1610, the method 1600 may include receiving downlink controlinformation for the second UE based at least in part on the indicationof at least the second UE. The operation(s) at block 1610 may beperformed using the wireless communication management module 720, 820,1160, or 1384 described with reference to FIG. 7, 8, 11, or 13, or theDCI processing module 735 or 835 or the second UE DCI processing module745 or 845 described with reference to FIG. 7 or 8.

At block 1615, the method 1600 may include receiving a set of NOMAdownlink transmissions at the first UE based at least in part on thedownlink control information for the first UE and the downlink controlinformation for the second UE. The operation(s) at block 1615 may beperformed using the wireless communication management module 720, 820,1160, or 1384 described with reference to FIG. 7, 8, 11, or 13, or theNOMA transmission processing module 750 or 850 described with referenceto FIG. 7 or 8.

Thus, the method 1600 may provide for wireless communication. It shouldbe noted that the method 1600 is just one implementation and that theoperations of the method 1600 may be rearranged or otherwise modifiedsuch that other implementations are possible.

FIG. 17 is a flow chart illustrating an example of a method 1700 forwireless communication, in accordance with various aspects of thepresent disclosure. For clarity, the method 1700 is described below withreference to aspects of one or more of the UEs 115, 315, 315-a, 1115, or1315 described with reference to FIG. 1, 3, 11, or 13, or aspects of oneor more of the apparatuses 715 or 815 described with reference to FIG. 7or 8. In some examples, a UE or apparatus may execute one or more setsof codes to control the functional elements of the UE or apparatus toperform the functions described below. Additionally or alternatively,the UE or apparatus may perform one or more of the functions describedbelow using special-purpose hardware.

At block 1705, the method 1700 may include receiving downlink controlinformation for a first UE. In some examples, the downlink informationfor the first UE may be received based at least in part on an RNTIassociated with the first UE. The downlink control information for thefirst UE may include an indication of at least a second UE. In someexamples, the indication of at least the second UE may include an RNTIassociated with the second UE. In some examples, the indication of atleast the second UE may include an index associated with a set of otherUEs that can be configured to operate in a NOMA group with the first UE.The set of other UEs may include the second UE. In some examples, themethod 1700 may include determining an RNTI associated with the secondUE based at least in part on the index. The operation(s) at block 1705may be performed using the wireless communication management module 720,820, 1160, or 1384 described with reference to FIG. 7, 8, 11, or 13, orthe DCI processing module 735 or 835 or the first UE DCI processingmodule 740 or 840 described with reference to FIG. 7 or 8.

At block 1710, the method 1700 may include receiving downlink controlinformation for the second UE based at least in part on the indicationof at least the second UE. In some examples, the indication of at leastthe second UE may include an indication of the second UE, and receivingthe downlink control information for the second UE may include decoding(e.g., descrambling (e.g., CRC-descrambling)) the downlink controlinformation for the second UE based at least in part on the indicationof the second UE. The operation(s) at block 1710 may be performed usingthe wireless communication management module 720, 820, 1160, or 1384described with reference to FIG. 7, 8, 11, or 13, or the DCI processingmodule 735 or 835 or the second UE DCI processing module 745 or 845described with reference to FIG. 7 or 8.

At block 1715, the method 1700 may include determining, based at leastin part on the downlink control information for the first UE and thedownlink control information for at least the second UE, that aninterfering transmission overlaps a first downlink transmission for thefirst UE. The operation(s) at block 1715 may be performed using thewireless communication management module 720, 820, 1160, or 1384described with reference to FIG. 7, 8, 11, or 13, or the interferencedetermination module 860 described with reference to FIG. 8.

At block 1720, the method 1700 may include receiving a set of NOMAdownlink transmissions at the first UE based at least in part on thedownlink control information for the first UE and the downlink controlinformation for the second UE. The operation(s) at block 1720 may beperformed using the wireless communication management module 720, 820,1160, or 1384 described with reference to FIG. 7, 8, 11, or 13, or theNOMA transmission processing module 750 or 850 described with referenceto FIG. 7 or 8.

At block 1725, the method 1700 may include performing an interferencecancellation operation on the interfering transmission(s). Theinterference cancellation operation may be performed based at least inpart on the downlink control information for the second UE. Theinterference cancellation operation may also be performed using an RNTIassociated with the second UE. In some examples the interferencecancellation operation may be performed based at least in part on thedownlink control information for each of a number of UEs other than thefirst UE in a NOMA group, depending on the determinations(s) made atblock 1715. The interference cancellation operation may also beperformed using RNTIs for each of the number of UEs other than the firstUE. In some examples, the interference cancellation operation mayinclude decoding the interfering transmission(s) and then canceling theinterfering transmission(s) from the set of NOMA downlink transmissionsreceived at block 1720. The operation(s) at block 1725 may be performedusing the wireless communication management module 720, 820, 1160, or1384 described with reference to FIG. 7, 8, 11, or 13, or theinterference cancellation module 865 described with reference to FIG. 8.

At block 1730, the method 1700 may include identifying, in the set ofNOMA downlink transmissions, the first downlink transmission for thefirst UE. In some examples, the first downlink transmission for thefirst UE may be identified using a first RNTI for the first UE. In someexamples, identifying the first downlink transmission for the first UEmay include descrambling (e.g., CRC-descrambling) the first downlinktransmission for the first UE. The operation(s) at block 1730 may beperformed using the wireless communication management module 720, 820,1160, or 1384 described with reference to FIG. 7, 8, 11, or 13, or theNOMA transmission processing module 750 or 850 described with referenceto FIG. 7 or 8.

Thus, the method 1700 may provide for wireless communication. It shouldbe noted that the method 1700 is just one implementation and that theoperations of the method 1700 may be rearranged or otherwise modifiedsuch that other implementations are possible.

FIG. 18 is a flow chart illustrating an example of a method 1800 forwireless communication, in accordance with various aspects of thepresent disclosure. For clarity, the method 1800 is described below withreference to aspects of one or more of the UEs 115, 415, 415-a, 1115, or1315 described with reference to FIG. 1, 4, 11, or 13, or aspects of oneor more of the apparatuses 915 or 1015 described with reference to FIG.9 or 10. In some examples, a UE or apparatus may execute one or moresets of codes to control the functional elements of the UE or apparatusto perform the functions described below. Additionally or alternatively,the UE or apparatus may perform one or more of the functions describedbelow using special-purpose hardware.

At block 1805, the method 1800 may include receiving, at a first UE, atleast one control channel element associated with the first UE. The atleast one control channel element may include downlink controlinformation for the first UE and at least a second UE. The operation(s)at block 1805 may be performed using the wireless communicationmanagement module 920, 1020, 1160, or 1384 described with reference toFIG. 9, 10, 11, or 13, or the control channel processing module 935 or1035 described with reference to FIG. 9 or 10.

At block 1810, the method 1800 may include receiving a set of NOMAdownlink transmissions at the first UE based at least in part on thedownlink control information for the first UE and at least the secondUE. The operation(s) at block 1810 may be performed using the wirelesscommunication management module 920, 1020, 1160, or 1384 described withreference to FIG. 9, 10, 11, or 13, or the NOMA transmission processingmodule 940 or 1040 described with reference to FIG. 9 or 10.

Thus, the method 1800 may provide for wireless communication. It shouldbe noted that the method 1800 is just one implementation and that theoperations of the method 1800 may be rearranged or otherwise modifiedsuch that other implementations are possible.

FIG. 19 is a flow chart illustrating an example of a method 1900 forwireless communication, in accordance with various aspects of thepresent disclosure. For clarity, the method 1900 is described below withreference to aspects of one or more of the UEs 115, 415, 415-a, 1115, or1315 described with reference to FIG. 1, 4, 11, or 13, or aspects of oneor more of the apparatuses 915 or 1015 described with reference to FIG.9 or 10. In some examples, a UE or apparatus may execute one or moresets of codes to control the functional elements of the UE or apparatusto perform the functions described below. Additionally or alternatively,the UE or apparatus may perform one or more of the functions describedbelow using special-purpose hardware.

At block 1905, the method 1900 may include receiving, at a first UE, atleast one control channel element associated with the first UE. The atleast one control channel element may include downlink controlinformation for the first UE and at least a second UE. In some examples,receiving the at least one control channel element may include receivinga single control channel element associated with the first UE. Thesingle control channel element may include the downlink controlinformation for the first UE and at least the second UE. In someexamples, receiving the at least one control channel element may includereceiving a first control channel element associated with the first UEand receiving at least a second control channel element associated withthe first UE. The first control channel element may include the downlinkcontrol information for the first UE, and at least the second controlchannel element may include the downlink control information for atleast the second UE. The operation(s) at block 1905 may be performedusing the wireless communication management module 920, 1020, 1160, or1384 described with reference to FIG. 9, 10, 11, or 13, or the controlchannel processing module 935 or 1035 described with reference to FIG. 9or 10.

At block 1910, the method 1900 may include determining, based at leastin part on the downlink control information for the first UE and atleast the second UE, that an interfering transmission overlaps a firstdownlink transmission for the first UE. The operation(s) at block 1910may be performed using the wireless communication management module 920,1020, 1160, or 1384 described with reference to FIG. 9, 10, 11, or 13,or the interference determination module 1050 described with referenceto FIG. 10.

At block 1915, the method 1900 may include receiving a set of NOMAdownlink transmissions at the first UE based at least in part on thedownlink control information for the first UE and at least the secondUE. The operation(s) at block 1915 may be performed using the wirelesscommunication management module 920, 1020, 1160, or 1384 described withreference to FIG. 9, 10, 11, or 13, or the NOMA transmission processingmodule 940 or 1040 described with reference to FIG. 9 or 10.

At block 1920, the method 1900 may include performing an interferencecancellation operation on the interfering transmission(s). Theinterference cancellation operation may be performed based at least inpart on the downlink control information for the second UE. In someexamples, the interference cancellation operation may be further basedat least in part on a UE identifier associated with the second UE (e.g.,an RNTI associated with the second UE). In some examples, theinterference cancellation operation may include decoding (e.g.,descrambling (e.g., CRC-descrambling)) the interfering transmissionusing the RNTI associated with the second UE. In some examples theinterference cancellation operation may be performed based at least inpart on the downlink control information for each of a number of UEsother than the first UE in a NOMA group, depending on thedeterminations(s) made at block 1910. The interference cancellationoperation may also be performed using RNTIs for each of the number ofUEs other than the first UE. In some examples, the interferencecancellation operation may include decoding the interferingtransmission(s) and then canceling the interfering transmission(s) fromthe set of NOMA downlink transmissions received at block 1915. Theoperation(s) at block 1920 may be performed using the wirelesscommunication management module 920, 1020, 1160, or 1384 described withreference to FIG. 9, 10, 11, or 13, or the interference cancellationmodule 1055 described with reference to FIG. 10.

At block 1925, the method 1900 may include identifying, in the set ofNOMA downlink transmissions, the first downlink transmission for thefirst UE. In some examples, the first downlink transmission for thefirst UE may be identified using a first RNTI for the first UE. In someexamples, identifying the first downlink transmission for the first UEmay include descrambling (e.g., CRC-descrambling) the first downlinktransmission for the first UE. The operation(s) at block 1925 may beperformed using the wireless communication management module 920, 1020,1160, or 1384 described with reference to FIG. 9, 10, 11, or 13, or theNOMA transmission processing module 940 or 1040 described with referenceto FIG. 9 or 10.

Thus, the method 1900 may provide for wireless communication. It shouldbe noted that the method 1900 is just one implementation and that theoperations of the method 1900 may be rearranged or otherwise modifiedsuch that other implementations are possible.

In some examples, aspects of one or more of the methods 1400, 1500,1600, 1700, 1800, or 1900 described with reference to FIG. 14, 15, 16,17, 18, or 19 may be combined.

FIG. 20 shows a wireless communication system 2000 in whichtransmissions by various wireless devices may interfere with receptionsof transmissions by various other wireless devices, in accordance withvarious aspects of the present disclosure. The wireless communicationsystem 2000 may be an example of portions of the wireless communicationsystem 100 described with reference to FIG. 1. Moreover, a first basestation 2005, a second base station 2005-a, a third base station 2005-b,a fourth base station 2005-c, a fifth base station 2005-d, and a sixthbase station 2005-e may be examples of aspects of one or more of thebase stations 105 described with reference to FIG. 1, while a first UE2015, a second UE 2015-a, a third UE 2015-b, a fourth UE 2015-c, a fifthUE 2015-d, and a sixth UE 2015-e may be examples of aspects of one ormore of the UEs 115 described with reference to FIG. 1.

In a first interference scenario shown in FIG. 20, the first basestation 2005 may transmit a first downlink transmission 2020 to thefirst UE 2015, and the second base station 2005-a may transmit a seconddownlink transmission 2025 to the second UE 2015-a. When the signalstrength of the first downlink transmission 2020 is great enough, orwhen the first base station 2005 and the second UE 2015-a are closeenough to one another, the second UE 2015-a may receive the firstdownlink transmission 2020 as a first interfering transmission 2020-a.Similarly, when the signal strength of the second downlink transmission2025 is great enough or when the second base station 2005-a and thefirst UE 2015 are close enough to one another, the first UE 2015 mayreceive the second downlink transmission 2025 as a second interferingtransmission 2025-a. The first interfering transmission 2020-a mayinterfere with the second UE's reception of the second downlinktransmission 2025. The second interfering transmission 2025-a mayinterfere with the first UE's reception of the first downlinktransmission 2020.

In a second interference scenario shown in FIG. 20, the third basestation 2005-b may receive a first uplink transmission 2030 from thethird UE 2015-b, and the fourth base station 2005-c may transmit a thirddownlink transmission 2035 to the fourth UE 2015-c. When the signalstrength of the third downlink transmission 2035 is great enough, orwhen the third base station 2005-b and the fourth base station 2005-care close enough to one another, the third base station 2005-b mayreceive the third downlink transmission 2035 as a third interferingtransmission 2035-a. The third interfering transmission 2035-a mayinterfere with the third base station's reception of the first uplinktransmission 2030.

In a third interference scenario shown in FIG. 20, the fifth basestation 2005-d may receive a second uplink transmission 2040 from thefifth UE 2015-d, and the sixth base station 2005-e may receive a thirduplink transmission 2045 from the sixth UE 2015-e. When the signalstrength of the second uplink transmission 2040 is great enough, or whenthe fifth UE 2015-d and the sixth base station 2005-e are close enoughto one another, the sixth base station 2005-e may receive the seconduplink transmission 2040 as a fourth interfering transmission 2040-a.Similarly, when the signal strength of the third uplink transmission2045 is great enough, or when the sixth UE 2015-e and the fifth basestation 2005-d are close enough to one another, the fifth base station2005-d may receive the third uplink transmission 2045 as a fifthinterfering transmission 2045-a. The fourth interfering transmission2040-a may interfere with the sixth base station's reception of thethird uplink transmission 2045. The fifth interfering transmission2045-a may interfere with the fifth base station's reception of thesecond uplink transmission 2040.

When one of the interference scenarios shown in FIG. 20 arises, it maybe useful to perform an interference cancellation operation, such as acodeword level interference cancellation (CWIC) operation or asymbol-level interference cancellation (SLIC) operation, on theinterfering transmission. However, the ability of a device to perform aninterference cancellation operation may depend on the device's knowledgeof parameters such as a transmission format, a data rate, a rank, amodulation and coding scheme (MCS), or assigned resource blocks for theinterfering transmission. The performance of an interferencecancellation operation may also depend on a device's knowledge of aradio network temporary identifier (RNTI) associated with theinterfering transmission. In some examples, the parameters needed toperform an interference cancellation operation on an interferingtransmission may be obtained by way of blind detection of one or moretransmissions (e.g., blind detection of one or more transmissions to orfrom another device). In other examples, the parameters needed toperform an interference cancellation operation may be obtained asdescribed, for example, with reference to FIGS. 24, 25, 26, 27, 30, 31,and 36.

In some examples, an interference scenario such as the interferencescenario described with reference to the third base station 2005-b, thethird UE 2015-b, the fourth base station 2005-c, and the fourth UE2015-c may arise in an environment where wireless devices are allowed tooperate in an enhanced interference mitigation and traffic adaptation(eIMTA) environment.

FIG. 21 shows a table 2100 of various time domain duplexing (TDD)uplink-downlink (UL-DL) configurations (e.g., configurations 0, 1, 2, 3,4, 5, and 6) used for a frame of communications in an LTE/LTE-A system,in accordance with various aspects of the present disclosure. Downlinksubframes are indicated in the figure by a “D,” uplink subframes areindicated by a “U,” and special subframes are indicated by an “S.” TheUL-DL configurations may be classified, in one respect, based on theirdownlink-to-uplink switch-point periodicity. More specifically,configurations 0, 1, 2, and 6 are characterized by a downlink-to-uplinkswitch-point periodicity of 5 milliseconds (ms), whereas configurations3, 4, and 5 are characterized by a downlink-to-uplink switch-pointperiodicity of 10 ms.

When an operator employs eIMTA, different cells of the operator mayemploy different ones of the UL-DL configurations during a same frame ofcommunications. Assuming the cells operate synchronously, all of thecells may communicate the same type of subframe (e.g., a D subframe, a Usubframe, or an S subframe) during subframe numbers 0, 1, 2, and 5.However, different cells employing different UL-DL configurations maycommunicate different types of subframes during subframe numbers 3, 4,6, 7, 8, and 9. When different cells communicate different types ofsubframes during a same subframe (e.g., when one cell is operating in adownlink subframe configuration during a subframe while another cell isoperating in an uplink subframe configuration during the subframe), thelikelihood of an inter-cell interference scenario arising, such as theinterference scenario described with reference to the third base station2005-b, the third UE 2015-b, the fourth base station 2005-c, and thefourth UE 2015-c of FIG. 22, may increase.

In some examples, a base station and UE may communicate over anunlicensed radio frequency spectrum band. Because the unlicensed radiofrequency spectrum band may be shared by apparatuses operating underdifferent protocols (e.g., different RATs, such as a cellular RAT and aWi-Fi RAT), transmitting devices may contend for access to theunlicensed radio frequency spectrum band. In some examples, one or moreof the interference scenarios described with reference to FIG. 20 mayarise when a base station and a UE are communicating over an unlicensedradio frequency spectrum band or a licensed radio frequency spectrumband (e.g., a radio frequency spectrum band for which apparatuses do notcontend for access because the radio frequency spectrum band is licensedto particular users for particular uses, such as a licensed radiofrequency spectrum band usable for LTE/LTE-A communications).

FIG. 22 shows a wireless communication system 2200 in which LTE/LTE-Amay be deployed under different scenarios using an unlicensed radiofrequency spectrum band, in accordance with various aspects of thepresent disclosure. More specifically, FIG. 22 illustrates examples of asupplemental downlink mode, a carrier aggregation mode, and a standalonemode in which LTE/LTE-A is deployed using an unlicensed radio frequencyspectrum band. The wireless communication system 2200 may be an exampleof portions of the wireless communication system 100 or 2000 describedwith reference to FIG. 1 or 20. Moreover, a first base station 2205 anda second base station 2205-a may be examples of aspects of one or moreof the base stations 105, 2005, 2005-a, 2005-b, 2005-c, 2005-d, or2005-e described with reference to FIG. 1 or 20, while a first UE 2215,a second UE 2215-a, a third UE 2215-b, and a fourth UE 2215-c may beexamples of aspects of one or more of the UEs 115, 2015, 2015-a, 2015-b,2015-c, 2015-d, or 2015-e described with reference to FIG. 1 or 20.

In the example of a supplemental downlink mode in the wirelesscommunication system 2200, the first base station 2205 may transmitOFDMA waveforms to the first UE 2215 using a downlink channel 2220. Thedownlink channel 2220 may be associated with a frequency F1 in anunlicensed radio frequency spectrum band. The first base station 2205may transmit OFDMA waveforms to the first UE 2215 using a firstbidirectional link 2225 and may receive SC-FDMA waveforms from the firstUE 2215 using the first bidirectional link 2225. The first bidirectionallink 2225 may be associated with a frequency F4 in a licensed radiofrequency spectrum band. The downlink channel 2220 in the unlicensedradio frequency spectrum band and the first bidirectional link 2225 inthe licensed radio frequency spectrum band may operate concurrently. Thedownlink channel 2220 may provide a downlink capacity offload for thefirst base station 2205. In some examples, the downlink channel 2220 maybe used for unicast services (e.g., addressed to one UE) or formulticast services (e.g., addressed to several UEs). This scenario mayoccur with any service provider (e.g., a mobile network operator (MNO))that uses a licensed radio frequency spectrum band and needs to relievesome of the traffic or signaling congestion.

In one example of a carrier aggregation mode in the wirelesscommunication system 2200, the first base station 2205 may transmitOFDMA waveforms to the second UE 2215-a using a second bidirectionallink 2230 and may receive OFDMA waveforms, SC-FDMA waveforms, orresource block interleaved FDMA waveforms from the second UE 2215-ausing the second bidirectional link 2230. The second bidirectional link2230 may be associated with the frequency F1 in the unlicensed radiofrequency spectrum band. The first base station 2205 may also transmitOFDMA waveforms to the second UE 2215-a using a third bidirectional link2235 and may receive SC-FDMA waveforms from the second UE 2215-a usingthe third bidirectional link 2235. The third bidirectional link 2235 maybe associated with a frequency F2 in a licensed radio frequency spectrumband. The second bidirectional link 2230 may provide a downlink anduplink capacity offload for the first base station 2205. Like thesupplemental downlink described above, this scenario may occur with anyservice provider (e.g., MNO) that uses a licensed radio frequencyspectrum band and needs to relieve some of the traffic or signalingcongestion.

In another example of a carrier aggregation mode in the wirelesscommunication system 2200, the first base station 2205 may transmitOFDMA waveforms to the third UE 2215-b using a fourth bidirectional link2240 and may receive OFDMA waveforms, SC-FDMA waveforms, or resourceblock interleaved waveforms from the third UE 2215-b using the fourthbidirectional link 2240. The fourth bidirectional link 2240 may beassociated with a frequency F3 in the unlicensed radio frequencyspectrum band. The first base station 2205 may also transmit OFDMAwaveforms to the third UE 2215-b using a fifth bidirectional link 2245and may receive SC-FDMA waveforms from the third UE 2215-b using thefifth bidirectional link 2245. The fifth bidirectional link 2245 may beassociated with the frequency F2 in the licensed radio frequencyspectrum band. The fourth bidirectional link 2240 may provide a downlinkand uplink capacity offload for the first base station 2205. Thisexample and those provided above are presented for illustrative purposesand there may be other similar modes of operation or deploymentscenarios that combine LTE/LTE-A in a licensed radio frequency spectrumband and use an unlicensed radio frequency spectrum band for capacityoffload.

As described above, one type of service provider that may benefit fromthe capacity offload offered by using LTE/LTE-A in an unlicensed radiofrequency spectrum band is a traditional MNO having access rights to anLTE/LTE-A licensed radio frequency spectrum band. For these serviceproviders, an operational example may include a bootstrapped mode (e.g.,supplemental downlink, carrier aggregation) that uses the LTE/LTE-Aprimary component carrier (PCC) on the licensed radio frequency spectrumband and at least one secondary component carrier (SCC) on theunlicensed radio frequency spectrum band.

In the carrier aggregation mode, data and control may, for example, becommunicated in the licensed radio frequency spectrum band (e.g., viafirst bidirectional link 2225, third bidirectional link 2235, and fifthbidirectional link 2245) while data may, for example, be communicated inthe unlicensed radio frequency spectrum band (e.g., via secondbidirectional link 2230 and fourth bidirectional link 2240). The carrieraggregation mechanisms supported when using an unlicensed radiofrequency spectrum band may fall under a hybrid frequency divisionduplexing-time division duplexing (FDD-TDD) carrier aggregation or aTDD-TDD carrier aggregation with different symmetry across componentcarriers.

In one example of a standalone mode in the wireless communication system2200, the second base station 2205-a may transmit OFDMA waveforms to thefourth UE 2215-c using a bidirectional link 2250 and may receive OFDMAwaveforms, SC-FDMA waveforms, or resource block interleaved FDMAwaveforms from the fourth UE 2215-c using the bidirectional link 2250.The bidirectional link 2250 may be associated with the frequency F3 inthe unlicensed radio frequency spectrum band. The standalone mode may beused in non-traditional wireless access scenarios, such as in-stadiumaccess (e.g., unicast, multicast). An example of a type of serviceprovider for this mode of operation may be a stadium owner, cablecompany, event host, hotel, enterprise, or large corporation that doesnot have access to a licensed radio frequency spectrum band.

In some examples, a transmitting device such as one of the base stations105, 2005, 2005-a, 2005-b, 2005-c, 2005-e, 2005-e, 2205, or 2205-adescribed with reference to FIG. 1, 20, or 22, or one of the UEs 115,2015, 2015-a, 2015-b, 2015-c, 2015-d, 2015-e, 2215, 2215-a, 2215-b, or2215-c described with reference to FIG. 1, 20, or 22, may use a gatinginterval to gain access to a channel of an unlicensed radio frequencyspectrum band (e.g., to a physical channel of the unlicensed radiofrequency spectrum band). In some examples, the gating interval may beperiodic. For example, the periodic gating interval may be synchronizedwith at least one boundary of an LTE/LTE-A radio interval. The gatinginterval may define the application of a contention-based protocol, suchas an LBT protocol based on the LBT protocol specified in EuropeanTelecommunications Standards Institute (ETSI) (EN 301 893). When using agating interval that defines the application of an LBT protocol, thegating interval may indicate when a transmitting device needs to performa contention procedure (e.g., an LBT procedure) such as a clear channelassessment (CCA) procedure. The outcome of the CCA procedure mayindicate to the transmitting apparatus whether a channel of anunlicensed radio frequency spectrum band is available or in use for thegating interval (also referred to as an LBT radio frame). When a CCAprocedure indicates that the channel is available for a correspondingLBT radio frame (e.g., “clear” for use), the transmitting apparatus mayreserve or use the channel of the unlicensed radio frequency spectrumband during part or all of the LBT radio frame. When the CCA procedureindicates that the channel is not available (e.g., that the channel isin use or reserved by another transmitting apparatus), the transmittingapparatus may be prevented from using the channel during the LBT radioframe.

In some examples, the performance of an interference cancellationoperation in a wireless communication system such as the wirelesscommunication system 100, 2000, or 2200 described with reference to FIG.1, 20, or 22, or the performance of an interference cancellationoperation in an eIMTA environment such as the eIMTA environmentdescribed with reference to FIG. 21, may be facilitated by theestablishment of one or more RNTI groups. In some examples, each of anumber of base stations may define one or more RNTI groups and assigneach RNTI group a group identifier (e.g., a group RNTI). Each RNTI groupmay include a set of UEs served by the base station. In some examples,the UEs in an RNTI group may utilize a new transmission mode (TM; e.g.,TM13). In some examples, each group RNTI may be a 16-bit value. In someexamples, a base station that has defined an RNTI group may assign eachof the UEs within the RNTI group a UE identifier (e.g., a uniqueidentifier within the RNTI group). In some examples, each UE identifiermay be an 8-bit value. The establishment and use of RNTI groups isdescribed, for example, with reference to FIGS. 23-36.

FIG. 23 shows a message flow 2300 between a first UE 2315, a second UE2315-a, and a base station 2305, in accordance with various aspects ofthe present disclosure. In some examples, the first UE 2315 or thesecond UE 2315-a may be an example of aspects of one or more of the UEs115, 2015, 2015-a, 2015-b, 2015-c, 2015-d, 2015-e, 2215, 2215-a, 2215-b,or 2215-c described with reference to FIG. 1, 20, or 22. In someexamples, the base station 2305 may be an example of aspects of one ormore of the base stations 105, 2005, 2005-a, 2005-b, 2005-c, 2005-d,2005-e, 2205, or 2205-a described with reference to FIG. 1, 2, or 4. Insome examples, each of the first UE 2315 and the second UE 2315-a, andin some examples other UEs (not shown), may be members of an RNTI group.Messages may be transmitted between the first UE 2315, the second UE2315-a, or the base station 2305 over at least one radio frequencyspectrum band (e.g., a licensed radio frequency spectrum band or anunlicensed radio frequency spectrum band).

As shown in FIG. 23, the base station 2305 may transmit a respective UEidentifier to each of the UEs in the RNTI group. For example, the basestation 2305 may transmit a first UE identifier 2320 to the first UE2315 and a second UE identifier 2325 to the second UE 2315-a. The firstUE identifier 2320 may identify the first UE 2315, and the second UEidentifier 2325 may identify the second UE 2315-a. In some examples, thebase station 2305 may also transmit a range of UE identifiers to each ofthe UEs in the RNTI group. The range of UE identifiers may include atleast the first UE identifier 2320 and the second UE identifier 2325. Inother examples, each of the UEs in the RNTI group, including the firstUE 2315 and the second UE 2315-a, may transmit its UE identifier to thebase station 2305.

The base station 2305 may also transmit a first group identifier 2330 toeach of the UEs in the RNTI group (e.g., to the first UE 2315 and thesecond UE 2315-a). In some examples, the first group identifier 2330 mayinclude a first group RNTI. In some examples, the first group identifier2330 may be transmitted to the first UE 2315 and the second UE 2315-aduring a random access procedure.

The base station 2305 may further transmit downlink control information2335 (e.g., one or more physical downlink control channels (PDCCHs) orenhanced PDCCHs (ePDCCHs) containing downlink control information) toone or more of the UEs in the first RNTI group (e.g., to the first UE2315 or the second UE 2315-a). In some examples, the downlink controlinformation 2335 may be transmitted for a subframe of wirelesscommunications between the base station 2305 and one or more of the UEsin the RNTI group. In some examples, the downlink control information2335 may be transmitted at the beginning of a subframe. In someexamples, the downlink control information 2335 may include downlinkcontrol information for each UE, in the first RNTI group, with which thebase station 2305 intends to communicate during a subframe. In someexamples, the downlink control information 2335 for each UE in the firstRNTI group may be encoded (e.g., scrambled (e.g., cyclic redundancycheck (CRC)-scrambled)) using the first group identifier 2330. In someexamples, the downlink control information 2335 for each UE in the firstRNTI group may be encoded (e.g., scrambled (e.g., CRC-scrambled)) usinga deterministic function (e.g., an XOR) of the first group identifier2330 and the UE identifier for the UE. For example, downlink controlinformation for the first UE 2315 may be encoded (e.g., scrambled (e.g.,CRC-scrambled)) using a deterministic function (e.g., an XOR) of thefirst group identifier 2330 and the first UE identifier 2320.

At block 2340, the first UE 2315 may receive the downlink controlinformation 2335 and determine whether the downlink control information2335 corresponds to the first UE 2315. In some examples, the downlinkcontrol information 2335 may be received in one or more PDCCHs orePDCCHs. In some examples, the downlink control information 2335 may bereceived for one or more UEs in the first RNTI group using the firstgroup identifier 2330. For example, downlink control information for thefirst UE 2315 may be decoded (e.g., descrambled (e.g., CRC-descrambled))using the first group identifier 2330. In some examples, the downlinkcontrol information 2335 may be received for one or more UEs in thefirst RNTI group using a deterministic function (e.g., an XOR) of thefirst group identifier 2330 and a UE identifier assigned to the UE. Forexample, downlink control information for the first UE 2315 may bedecoded (e.g., descrambled (e.g., CRC-descrambled)) based at least inpart on a deterministic function of the first group identifier 2330 andthe first UE identifier 2320.

In examples in which the downlink control information for a UE isscrambled using the first group identifier 2330, the downlink controlinformation for the first UE 2315 may reference (e.g., include) thefirst UE identifier 2320. Inclusion of the first UE identifier 2320, inthe downlink control information for the first UE 2315, may enable thefirst UE 2315 to distinguish the downlink control information for thefirst UE 2315 from downlink control information for at least one otherUE in the first RNTI group, and thereby identify the downlink controlinformation for the first UE 2315 based at least in part on the first UEidentifier 2320. For example, the first UE 2315 may sometimes receivedownlink control information for the second UE 2315-a, which downlinkcontrol information for the second UE 2315-a may also be decoded usingthe first group identifier 2330. However, because the downlink controlinformation for the second UE 2315-a does not reference (e.g., include)the first UE identifier 2320, the first UE 2315 may determine that thedownlink control information for the second UE 2315-a is not intendedfor the first UE 2315. In examples in which the downlink controlinformation for a UE is scrambled using a deterministic function (e.g.,an XOR) of the first group identifier 2330 and a UE identifier, thedownlink control information for the first UE 2315 may not include thefirst UE identifier 2320, and the first UE 2315 may identify thedownlink control information for the first UE 2315 based at least inpart on an ability to decode (e.g., descramble (e.g., CRC-descramble))the downlink control information for the first UE 2315.

When the first UE 2315 determines that the downlink control information2335 does not include downlink control information for the first UE2315, the first UE 2315 may not perform the operation(s) at blocks 2345or 2355 (e.g., for a current subframe of wireless communications betweenthe base station 2305 and one or more of the UEs in the RNTI group).When the first UE 2315 determines that the downlink control information2335 does include downlink control information for the first UE 2315,the first UE 2315 may process the downlink control information for thefirst UE 2315 to determine, for example, a transmission format, a datarate, a rank, an MCS, assigned resource blocks, or hybrid automaticrepeat request (HARD) information for a downlink data transmission(e.g., a physical downlink shared channel (PDSCH)) directed to the firstUE 2315.

At block 2345, the first UE 2315 may determine a first RNTI based atleast in part on the first UE identifier 2320. In some examples, thefirst RNTI may be based at least in part on a deterministic function(e.g., an XOR) of the first UE identifier 2320 and the first groupidentifier 2330.

At some point in time following transmission of the downlink controlinformation 2335 (and in some examples, immediately following), the basestation 2305 may transmit a first downlink data transmission 2350 (e.g.,a first PDSCH) to the first UE 2315 or transmit a second downlink datatransmission 2355 (e.g., a second PDSCH) to the second UE 2315-a, asindicated in the downlink control information 2335. In some examples,the first downlink data transmission 2350 and the second downlink datatransmission 2355 may be received by each of the UEs in the RNTI group.In some examples, the first downlink data transmission 2350 may bescrambled (e.g., CRC-scrambled) using the first RNTI, and the seconddownlink data transmission 2355 may be scrambled (e.g., CRC-scrambled)using a second RNTI. In some examples, the second RNTI may be based atleast in part on the second UE identifier 2325, and in some examples,the second RNTI may be based at least in part on a deterministicfunction (e.g., an exclusive-OR (XOR)) of the second UE identifier 2325and the first group identifier 2330.

At block 2350, the first UE 2315 may identify or decode the firstdownlink data transmission 2350. In some examples, the first downlinkdata transmission 2350 may be identified or decoded (e.g., descrambled)using the first RNTI.

FIG. 24 shows a message flow 2400 between a first UE 2415, a second UE2415-a, a first base station 2405, and a second base station 2405-a, inaccordance with various aspects of the present disclosure. In someexamples, the first UE 2415 or the second UE 2415-a may be an example ofaspects of one or more of the UEs 115, 2015, 2015-a, 2015-b, 2015-c,2015-d, 2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315, or 2315-a describedwith reference to FIG. 1, 2, 4, or 5. In some examples, the first basestation 2405 or the second base station 2405-a may be an example ofaspects of one or more of the base stations 105, 2005, 2005-a, 2005-b,2005-c, 2005-d, 2005-e, 2205, 2205-a, or 2305 described with referenceto FIG. 1, 2, 4, or 5. Messages may be transmitted between the first UE2415, the second UE 2415-a, the first base station 2405, the or thesecond base station 2405-a over at least one radio frequency spectrumband (e.g., a licensed radio frequency spectrum band or an unlicensedradio frequency spectrum band).

In some examples, the first base station 2405 may transmit a UEidentifier to one or more of the UEs for which it operates as a servingbase station. This may include transmitting a first UE identifier 2420to the first UE 2415. The first UE identifier 2420 may identify thefirst UE 2415. In other examples, each of the UEs served by the firstbase station 2405, including the first UE 2415, may transmit its UEidentifier to the first base station 2405. When the first UE 2415 is amember of an RNTI group managed by the first base station 2405, thefirst base station 2405 may also transmit a first group identifier(e.g., a first group RNTI) to the first UE 2415. However, the first UE2415 need not be part of an RNTI group.

The first base station 2405 may also transmit an interfering groupidentifier 2425 to one or more of the UEs for which it operates as aserving base station, including, for example, the first UE 2415. Also oralternatively, a UE (e.g., the first UE 2415) may decode a systeminformation block (SIB) received from the second base station 2405-a,and extract the interfering group identifier 2425 from the SIB receivedfrom the second base station 2405-a. In some examples, the interferinggroup identifier 2425 may include an interfering group RNTI. Theinterfering group identifier may be associated with an interfering groupof devices, such as a group of devices included in an RNTI group managedby the second base station 2405-a. In some examples, the interferinggroup of devices may include the second UE 2415-a. The second basestation 2405-a may also be considered an interfering device, though nota member of the RNTI group including the interfering group of devices.One or more of the wireless devices in the interfering group of devicesmay receive an interfering transmission from the second base station2405-a, which interfering transmission interferes with the reception oftransmissions at the first UE 2415. For example, the second UE 2415-amay receive a transmission (e.g., the interfering transmission 2465)from the second base station 2405-a, which transmission from the secondbase station 2405-a interferes with the reception of a transmission(e.g., the first downlink data transmission 2460) from the first basestation 2405 at the first UE 2415.

In some examples, the first base station 2405 may also transmit, to oneor more of the UEs for which it operates as a serving base station(e.g., the first UE 2415), a range of UE identifiers for the UEsincluded in the interfering group of devices. Also or alternatively, aUE (e.g., the first UE 2415) may decode information transmitted to orfrom the second base station 2405-a or to or from a UE within theinterfering group of devices (e.g., the second UE 2415-a), and extractthe range of UE identifiers from the decoded information.

The first base station 2405 may transmit downlink control information2430 (e.g., one or more PDCCHs or ePDCCHs containing downlink controlinformation) to one or more of the UEs for which it operates as aserving base station, including, for example, the first UE 2415. In someexamples, the downlink control information 2430 may be transmitted for asubframe of wireless communications between the first base station 2405and one or more of the UEs for which the first base station 2405operates as a serving base station. In some examples, the downlinkcontrol information 2430 for the first UE 2415 may be encoded (e.g.,scrambled (e.g., CRC-scrambled)) using the first UE identifier 2420, orif the first UE 2415 is a member of a first RNTI group managed by thefirst base station 2405, the downlink control information 2430 may beencoded (e.g., scrambled (e.g., CRC-scrambled)) using a first groupidentifier of the first RNTI group, or encoded (e.g., scrambled (e.g.,CRC-scrambled)) using a deterministic function (e.g., an XOR) of thefirst group identifier and the first UE identifier 2420.

The second base station 2405-a may transmit downlink control information2435 (e.g., one or more PDCCHs or ePDCCHs containing downlink controlinformation) to one or more of the UEs in the interfering group ofdevices (e.g., to the second UE 2415-a). In some examples, the downlinkcontrol information 2435 may include downlink control information foreach UE, in the interfering group of devices, with which the second basestation 2405-a intends to communicate during a subframe. In someexamples, the downlink control information 2435 may be encoded (e.g.,scrambled (e.g., CRC-scrambled)) using the interfering group identifier2425. In some examples, the downlink control information 2435 for eachUE in the interfering group of devices may be encoded (e.g., scrambled(e.g., CRC-scrambled)) using a deterministic function (e.g., an XOR) ofthe interfering group identifier 2425 and a UE identifier for the UE.For example, downlink control information for the second UE 2415-a maybe encoded (e.g., scrambled (e.g., CRC-scrambled)) using a deterministicfunction (e.g., an XOR) of the interfering group identifier 2425 and asecond UE identifier assigned to the second UE 2415-a to identify thesecond UE 2415-a within the interfering group of devices.

At block 2440, the first UE 2415 may receive the downlink controlinformation 2435. In some examples, the downlink control information2435 may be received in one or more PDCCHs or ePDCCHs. In some examples,the downlink control information 2435 may be received for one or moreUEs in the interfering group of devices using the interfering groupidentifier 2425. For example, downlink control information for thesecond UE 2415-a may be decoded (e.g., descrambled (e.g.,CRC-descrambled)) using the interfering group identifier 2425. In someexamples, the downlink control information 2435 may be received for oneor more UEs in the interfering group of devices by attempting to receivedownlink control information for each of the UEs represented in therange of UE identifiers received for the interfering group of devices.For example, the downlink control information 2435 may be received for aUE in the interfering group of devices using a deterministic function(e.g., an XOR) of the interfering group identifier 2425 and a UEidentifier for the UE. For example, downlink control information for thesecond UE 2415-a may be decoded (e.g., descrambled (e.g.,CRC-descrambled)) based at least in part on a deterministic function ofthe interfering group identifier 2425 and a second UE identifierassigned to the second UE 2415-a to identify the second UE 2415-a withinthe interfering group of devices.

In examples in which the downlink control information for a UE isscrambled using the interfering group identifier 2425, the downlinkcontrol information for the UE may reference (e.g., include) a UEidentifier for the UE. Inclusion of the UE identifier, in the downlinkcontrol information for the UE, may enable the first UE 2415 to identifythe UE to which the downlink control information corresponds. Inexamples in which the downlink control information for a UE is scrambledusing a deterministic function (e.g., an XOR) of the interfering groupidentifier 2425 and a UE identifier, the downlink control informationfor the UE may not include a UE identifier, and the first UE 2415 mayidentify the UE to which the downlink control information correspondsbased at least in part on an ability to decode (e.g., descramble (e.g.,CRC-descramble)) the downlink control information for the UE using theinterfering group identifier 2425 and the UE identifier for the UE.

At block 2445, the first UE 2415 may receive the downlink controlinformation 2430 and determine whether the downlink control information2430 corresponds to the first UE 2415. In some examples, the downlinkcontrol information 2435 may be received in one or more PDCCHs orePDCCHs. In some examples, the operation(s) at block 2445 may includedecoding (e.g., descrambling (e.g., CRC-descrambling)) the downlinkcontrol information 2430 for the first UE 2415 using the first UEidentifier 2420. In some examples, the operation(s) at block 2445 mayinclude decoding (e.g., descrambling (e.g., CRC-descrambling)) thedownlink control information 2430 for the first UE 2415 using adeterministic function (e.g., an XOR) of a first RNTI group identifierand the first UE identifier 2420. When the first UE 2415 determines thatthe downlink control information 2430 does not include downlink controlinformation for the first UE 2415, the first UE 2415 may not perform theoperation(s) at blocks 2450, 2455, 2470, 2475, or 2480 (e.g., for acurrent subframe of wireless communications between the first basestation 2405 and one or more UEs including the first UE 2415). When thefirst UE 2415 determines that the downlink control information 2430 doesinclude downlink control information for the first UE 2415, the first UE2415 may process the downlink control information 2430 to determine, forexample, a transmission format, a data rate, a rank, an MCS, assignedresource blocks, or HARQ information for a first downlink datatransmission 2460 (e.g., a first PDSCH) to be transmitted from the firstbase station 2405 to the first UE 2415.

At block 2450, the first UE 2415 may identify, based at least in part onthe downlink control information 2435, an interfering transmission 2465.In some examples, the interfering transmission 2465 may include a seconddownlink data transmission (e.g., a second PDSCH transmission)transmitted from the second base station 2405-a to the second UE 2415-a.The interfering transmission 2465 may be considered interfering in thecontext of the first UE 2415, because it has the potential to interferewith the first UE's receipt of the first downlink data transmission2460. In some examples, the first UE 2415 may further identify theinterfering transmission 2465 based at least in part on the downlinkcontrol information 2430 (e.g., by identifying an overlap of resourcesassigned to the first downlink data transmission 2460 and theinterfering transmission 2465). The first UE 2415 may process thedownlink control information 2435 to determine, for example, atransmission format, a data rate, a rank, an MCS, assigned resourceblocks, or HARQ information for the interfering transmission 2465.

At block 2455, the first UE 2415 may determine an RNTI for theinterfering transmission 2465. The RNTI may be based at least in part ona second UE identifier included in the downlink control information2435. The second UE identifier may be an identifier of the second UE2415-a. In some examples, the RNTI for the interfering transmission 2465may be based at least in part on a deterministic function (e.g., an XOR)of the second UE identifier and the interfering group identifier 2425.

At some point in time following transmission of the downlink controlinformation 2435 and the downlink control information 2430 (and in someexamples, immediately following), the first base station 2405 maytransmit the first downlink data transmission 2460 (e.g., a first PDSCH)to the first UE 2415, as indicated in the downlink control information2430. In some examples, the first downlink data transmission 2460 may bescrambled (e.g., CRC-scrambled) using the first UE identifier 2420, orif the first UE 2415 is a member of a first RNTI group managed by thefirst base station 2405, the first downlink data transmission 2460 maybe scrambled (e.g., CRC-scrambled) using an RNTI based at least in parton a deterministic function (e.g., an XOR) of the first UE identifier2420 and a first group identifier of the first RNTI group.

Overlapping with the first downlink data transmission 2460, the secondbase station 2405-a may transmit the interfering transmission 2465(e.g., a second downlink data transmission (e.g., a second PDSCH)transmitted to the second UE 2415-a), as indicated in the downlinkcontrol information 2435. In some examples, the interfering transmission2465 may be scrambled using the determined RNTI for the interferingtransmission 2465.

At block 2470, the first UE 2415 may identify or decode the interferingtransmission 2465. In some examples, the interfering transmission 2465may be identified or decoded (e.g., descrambled) using the determinedRNTI for the interfering transmission 2465.

At block 2475, the first UE 2415 may perform an interferencecancellation operation (e.g., a CWIC operation or a SLIC operation) onthe interfering transmission 2465. In some examples, the interferencecancellation operation may be performed on a per-resource block basis.

At block 2480, the first UE 2415 may identify or decode the firstdownlink data transmission 2460 (e.g., in the absence of the canceledinterfering transmission 2465). In some examples, the first downlinkdata transmission 2460 may be identified or decoded (e.g., descrambled)using the first UE identifier 2420.

In some examples of the message flow 2400, a plurality of interferingtransmissions may be identified and canceled by performing aninterference cancellation operation (or by performing a plurality ofinterference cancellation operations).

FIG. 25 shows a message flow 2500 between a first UE 2515, a second UE2515-a, a first base station 2505, and a second base station 2505-a, inaccordance with various aspects of the present disclosure. In someexamples, the first UE 2515 or the second UE 2515-a may be an example ofaspects of one or more of the UEs 115, 2015, 2015-a, 2015-b, 2015-c,2015-d, 2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315, 2315-a, 2415, or2415-a described with reference to FIG. 1, 20, 22, 23, or 24. In someexamples, the first base station 2505 or the second base station 2505-amay be an example of aspects of one or more of the base stations 105,2005, 2005-a, 2005-b, 2005-c, 2005-d, 2005-e, 2205, 2205-a, 2305, 2405,or 2405-a described with reference to FIG. 1, 20, 22, 23, or 24.Messages may be transmitted between the first UE 2515, the second UE2515-a, the first base station 2505, the or the second base station2505-a over at least one radio frequency spectrum band (e.g., a licensedradio frequency spectrum band or an unlicensed radio frequency spectrumband).

In some examples of the message flow 2500, the described transmissionsbetween the first base station 2505 and the first UE 2515, and betweenthe second base station 2505-a and the second UE 2515-a, may occur overan unlicensed radio frequency spectrum band as described with referenceto FIG. 22. Before each of the first base station 2505 and the secondbase station 2505-a makes its respective transmissions over theunlicensed radio frequency spectrum band, each of the first base station2505 and the second base station 2505-a may perform a respective LBTprocedure to contend for access to the unlicensed radio frequencyspectrum band.

In some examples, the first base station 2505 may transmit a UEidentifier to one or more of the UEs for which it operates as a servingbase station. This may include transmitting a first UE identifier 2520to the first UE 2515. The first UE identifier 2520 may identify thefirst UE 2515. In other examples, each of the UEs served by the firstbase station 2505, including the first UE 2515, may transmit its UEidentifier to the first base station 2505. When the first UE 2515 is amember of an RNTI group managed by the first base station 2505, thefirst base station 2505 may also transmit a first group identifier(e.g., a first group RNTI) to the first UE 2515. However, the first UE2515 need not be part of an RNTI group.

The first base station 2505 may also transmit an interfering groupidentifier 2525 to one or more of the UEs for which it operates as aserving base station, including, for example, the first UE 2515. Also oralternatively, a UE (e.g., the first UE 2515) may decode a SIB receivedfrom the second base station 2505-a, and extract the interfering groupidentifier 2525 from the SIB received from the second base station2505-a. In some examples, the interfering group identifier 2525 mayinclude an interfering group RNTI. The interfering group identifier maybe associated with an interfering group of devices, such as a group ofdevices included in an RNTI group managed by the second base station2505-a. In some examples, the interfering group of devices may includethe second UE 2515-a. The second base station 2505-a may also beconsidered an interfering device, though not a member of the RNTI groupincluding the interfering group of devices. One or more of the wirelessdevices in the interfering group of devices may receive an interferingtransmission from the second base station 2505-a, which interferingtransmission interferes with the reception of transmissions at the firstUE 2515. For example, the second UE 2515-a may receive a transmission(e.g., the downlink control information 2535 or the interferingtransmission 2570) from the second base station 2505-a, whichtransmission from the second base station 2505-a interferes with thereception of a transmission (e.g., the downlink control information 2530or the first downlink data transmission 2565) from the first basestation 2505 at the first UE 2515.

In some examples, the first base station 2505 may also transmit, to oneor more of the UEs for which it operates as a serving base station(e.g., the first UE 2515), a range of UE identifiers for the UEsincluded in the interfering group of devices. Also or alternatively, aUE (e.g., the first UE 2515) may decode information transmitted to orfrom the second base station 2505-a or to or from a UE within theinterfering group of devices (e.g., the second UE 2515-a), and extractthe range of UE identifiers from the decoded information.

The first base station 2505 may transmit downlink control information2530 (e.g., one or more PDCCHs or ePDCCHs containing downlink controlinformation) to one or more of the UEs for which it operates as aserving base station, including, for example, the first UE 2515. In someexamples, the downlink control information 2530 may be transmitted for asubframe of wireless communications between the first base station 2505and one or more of the UEs for which the first base station 2505operates as a serving base station. In some examples, the downlinkcontrol information 2530 for the first UE 2515 may be encoded (e.g.,scrambled (e.g., CRC-scrambled)) using the first UE identifier 2520, orif the first UE 2515 is a member of a first RNTI group managed by thefirst base station 2505, the downlink control information 2530 may beencoded (e.g., scrambled (e.g., CRC-scrambled)) using a first groupidentifier of the first RNTI group, or encoded (e.g., scrambled (e.g.,CRC-scrambled)) using a deterministic function (e.g., an XOR) of thefirst group identifier and the first UE identifier 2520).

The second base station 2505-a may transmit downlink control information2535 (e.g., one or more PDCCHs or ePDCCHs containing downlink controlinformation) to one or more of the UEs in the interfering group ofdevices (e.g., to the second UE 2515-a). In some examples, the downlinkcontrol information 2535 may include downlink control information foreach UE, in the interfering group of devices, with which the second basestation 2505-a intends to communicate during a subframe. In someexamples, the downlink control information 2535 may be encoded (e.g.,scrambled (e.g., CRC-scrambled)) using the interfering group identifier2525. In some examples, the downlink control information 2535 for eachUE in the interfering group of devices may be encoded (e.g., scrambled(e.g., CRC-scrambled)) using a deterministic function (e.g., an XOR) ofthe interfering group identifier 2525 and a UE identifier for the UE.For example, downlink control information for the second UE 2515-a maybe encoded (e.g., scrambled (e.g., CRC-scrambled)) using a deterministicfunction (e.g., an XOR) of the interfering group identifier 2525 and asecond UE identifier assigned to the second UE 2515-a to identify thesecond UE 2515-a within the interfering group of devices.

At block 2540, the first UE 2515 may receive the downlink controlinformation 2535. In some examples, the downlink control information2535 may be received in one or more PDCCHs or ePDCCHs. In some examples,the downlink control information 2535 may be received for one or moreUEs in the interfering group of devices using the interfering groupidentifier 2525. For example, downlink control information for thesecond UE 2515-a may be decoded (e.g., descrambled (e.g.,CRC-descrambled)) using the interfering group identifier 2525. In someexamples, the downlink control information 2535 may be received for oneor more UEs in the interfering group of devices by attempting to receivedownlink control information for each of the UEs represented in therange of UE identifiers received for the interfering group of devices.For example, the downlink control information 2535 may be received for aUE in the interfering group of devices using a deterministic function(e.g., an XOR) of the interfering group identifier 2525 and a UEidentifier for the UE. For example, downlink control information for thesecond UE 2515-a may be decoded (e.g., descrambled (e.g.,CRC-descrambled)) based at least in part on a deterministic function ofthe interfering group identifier 2525 and a second UE identifierassigned to the second UE 2515-a to identify the second UE 2515-a withinthe interfering group of devices.

In examples in which the downlink control information for a UE isscrambled using the interfering group identifier 2525, the downlinkcontrol information for the UE may reference (e.g., include) a UEidentifier for the UE. Inclusion of the UE identifier, in the downlinkcontrol information for the UE, may enable the first UE 2515 to identifythe UE to which the downlink control information corresponds. Inexamples in which the downlink control information for a UE is scrambledusing a deterministic function (e.g., an XOR) of the interfering groupidentifier 2525 and a UE identifier, the downlink control informationfor the UE may not include a UE identifier, and the first UE 2515 mayidentify the UE to which the downlink control information correspondsbased at least in part on an ability to decode (e.g., descramble (e.g.,CRC-descramble)) the downlink control information for the UE using theinterfering group identifier 2525 and the UE identifier for the UE.

At block 2545, and when the first UE 2515 is unable to decode thedownlink control information 2530 at block 2550, the first UE 2515 mayperform an interference cancellation operation (e.g., a CWIC operationor a SLIC operation) on the possibly interfering downlinktransmission(s) (e.g., PDCCHs, ePDCCHs, or PDSCHs) of the second basestation 2505-a that are discoverable as a result of decoding thedownlink control information 2535. In some examples, the interferencecancellation operation may be performed on a per-resource block basis.

At block 2550, the first UE 2515 may receive the downlink controlinformation 2530 (possibly in the absence of canceled interference) anddetermine whether the downlink control information 2530 corresponds tothe first UE 2515. In some examples, the downlink control information2535 may be received in one or more PDCCHs or ePDCCHs. In some examples,the operation(s) at block 2550 may include decoding (e.g., descrambling(e.g., CRC-descrambling)) the downlink control information 2530 for thefirst UE 2515 using the first UE identifier 2520. In some examples, theoperation(s) at block 2550 may include decoding (e.g., descrambling(e.g., CRC-descrambling)) the downlink control information 2530 for thefirst UE 2415 using a deterministic function (e.g., an XOR) of a firstRNTI group identifier and the first UE identifier 2520. When the firstUE 2515 determines that the downlink control information 2530 does notinclude downlink control information for the first UE 2515, the first UE2515 may not perform the operation(s) at blocks 2555, 2560, 2575, 2580,or 2585 (e.g., for a current subframe of wireless communications betweenthe first base station 2505 and one or more UEs including the first UE2515). When the first UE 2515 determines that the downlink controlinformation 2530 does include downlink control information for the firstUE 2515, the first UE 2515 may process the downlink control information2530 to determine, for example, a transmission format, a data rate, arank, an MCS, assigned resource blocks, or HARQ information for a firstdownlink data transmission 2565 (e.g., a first PDSCH) to be transmittedfrom the first base station 2505 to the first UE 2515.

At block 2555, the first UE 2515 may identify, based at least in part onthe downlink control information 2535, an interfering transmission 2570.In some examples, the interfering transmission 2570 may include a seconddownlink data transmission (e.g., a second PDSCH transmission)transmitted from the second base station 2505-a to the second UE 2515-a.The interfering transmission 2570 may be considered interfering in thecontext of the first UE 2515, because it has the potential to interferewith the first UE's receipt of the first downlink data transmission2565. In some examples, the first UE 2515 may further identify theinterfering transmission 2570 based at least in part on the downlinkcontrol information 2530 (e.g., by identifying an overlap of resourcesassigned to the first downlink data transmission 2565 and theinterfering transmission 2570). The first UE 2515 may process thedownlink control information 2535 to determine, for example, atransmission format, a data rate, a rank, an MCS, assigned resourceblocks, or HARQ information for the interfering transmission 2570.

At block 2560, the first UE 2515 may determine an RNTI for theinterfering transmission 2570. The RNTI may be based at least in part ona second UE identifier included in the downlink control information2535. The second UE identifier may be an identifier of the second UE2515-a. In some examples, the RNTI for the interfering transmission 2570may be based at least in part on a deterministic function (e.g., an XOR)of the second UE identifier and the interfering group identifier 2525.

At some point in time following transmission of the downlink controlinformation 2535 and the downlink control information 2530 (and in someexamples, immediately following), the first base station 2505 maytransmit the first downlink data transmission 2565 (e.g., a first PDSCH)to the first UE 2515, as indicated in the downlink control information2530. In some examples, the first downlink data transmission 2565 may bescrambled (e.g., CRC-scrambled) using the first UE identifier 2520, orif the first UE 2515 is a member of a first RNTI group managed by thefirst base station 2505, the first downlink data transmission 2565 maybe scrambled (e.g., CRC-scrambled) using an RNTI based at least in parton a deterministic function (e.g., an XOR) of the first UE identifier2520 and a first group identifier of the first RNTI group.

Overlapping with the first downlink data transmission 2565, the secondbase station 2505-a may transmit the interfering transmission 2570(e.g., a second downlink data transmission (e.g., a second PDSCH)transmitted to the second UE 2515-a), as indicated in the downlinkcontrol information 2535. In some examples, the interfering transmission2570 may be scrambled using the determined RNTI for the interferingtransmission 2570.

At block 2575, the first UE 2515 may identify or decode the interferingtransmission 2570. In some examples, the interfering transmission 2570may be identified or decoded (e.g., descrambled) using the determinedRNTI for the interfering transmission 2570.

At block 2580, the first UE 2515 may perform an interferencecancellation operation (e.g., a CWIC operation or a SLIC operation) onthe interfering transmission 2570. In some examples, the interferencecancellation operation may be performed on a per-resource block basis.

At block 2585, the first UE 2515 may identify or decode the firstdownlink data transmission 2565 (e.g., in the absence of the canceledinterfering transmission 2570). In some examples, the first downlinkdata transmission 2565 may be identified or decoded (e.g., descrambled)using the first UE identifier 2520.

In some examples of the message flow 2500, a plurality of interferingtransmissions may be identified and canceled by performing aninterference cancellation operation (or by performing a plurality ofinterference cancellation operations).

FIG. 26 shows a message flow 2600 between a first UE 2615, a second UE2615-a, a first base station 2605, and a second base station 2605-a, inaccordance with various aspects of the present disclosure. In someexamples, the first UE 2615 or the second UE 2615-a may be an example ofaspects of one or more of the UEs 115, 2015, 2015-a, 2015-b, 2015-c,2015-d, 2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315, 2315-a, 2415,2415-a, 2515, or 2515-a described with reference to FIG. 1, 2, 4, 5, 6,or 7. In some examples, the first base station 2605 or the second basestation 2605-a may be an example of aspects of one or more of the basestations 105, 2005, 2005-a, 2005-b, 2005-c, 2005-d, 2005-e, 2205,2205-a, 2305, 2405, 2405-a, 2505, or 2505-a described with reference toFIG. 1, 20, 22, 23, 24, or 25. In some examples, the first base station2605 may operate as a serving base station for the first UE 2615, andthe second base station 2605-a may operate as a serving base station forthe second UE 2615-a. Messages may be transmitted between the first UE2615, the second UE 2615-a, the first base station 2605, the or thesecond base station 2605-a over at least one radio frequency spectrumband (e.g., a licensed radio frequency spectrum band or an unlicensedradio frequency spectrum band).

In some examples of the message flow 2600, the described transmissionsbetween the first base station 2605 and the first UE 2615, and betweenthe second base station 2605-a and the second UE 2615-a, may occur in aneIMTA environment (e.g., where the first base station 2605 and first UE2615 are operating in an uplink subframe configuration while the secondbase station 2605-a and the second UE 2615-a are operating in a downlinksubframe configuration), as described with reference to FIG. 21.

In some examples of the message flow 2600, the described transmissionsbetween the first base station 2605 and the first UE 2615, and betweenthe second base station 2605-a and the second UE 2615-a, may occur overan unlicensed radio frequency spectrum band, as described with referenceto FIG. 22. Before each of the first base station 2605 and the secondbase station 2605-a makes its respective transmissions over theunlicensed radio frequency spectrum band, each of the first base station2605 and the second base station 2605-a may perform a respective LBTprocedure to contend for access to the unlicensed radio frequencyspectrum band.

As shown in FIG. 26, the second base station 2605-a may transmit aninterfering group identifier 2620 to the first base station 2605 or thefirst base station 2605 may otherwise acquire (e.g., request) theinterfering group identifier 2620. In some examples, the interferinggroup identifier 2620 may be transmitted from the second base station2605-a to the first base station 2605 over a backhaul link 134 (see,e.g., FIG. 1). Also or alternatively, the first base station 2605 maydecode a SIB received from the second base station 2605-a, and extractthe interfering group identifier 2620 from the SIB received from thesecond base station 2605-a. In some examples, the interfering groupidentifier 2620 may include an interfering group RNTI. The interferinggroup identifier may be associated with an interfering group of devices,such as a group of devices included in an RNTI group managed by thesecond base station 2605-a. In some examples, the interfering group ofdevices may include the second UE 2615-a. The second base station 2605-amay also be considered an interfering device, though not a member of theRNTI group including the interfering group of devices. One or more ofthe wireless devices in the interfering group of devices may receive aninterfering transmission from the second base station 2605-a, whichinterfering transmission interferes with the reception of transmissionsby the first base station 2605. For example, the second UE 2615-a mayreceive a transmission (e.g., the interfering transmission 2650) fromthe second base station 2605-a, which transmission from the second basestation 2605-a interferes with the reception of a transmission (e.g.,the uplink transmission 2645) from the first UE 2615 by the first basestation 2605.

In some examples, the second base station 2605-a may also transmit tothe first base station 2605 a range of UE identifiers included in theinterfering group of devices, or the first base station 2605 mayotherwise acquire (e.g., request) the range of UE identifiers.

The second base station 2605-a may transmit downlink control information2625 (e.g., one or more PDCCHs or ePDCCHs containing downlink controlinformation) to one or more of the UEs in the interfering group ofdevices (e.g., to the second UE 2615-a). In some examples, the downlinkcontrol information 2625 may include downlink control information foreach UE, in the interfering group of devices, with which the second basestation 2605-a intends to communicate during a subframe. In someexamples, the downlink control information 2625 may be encoded (e.g.,scrambled (e.g., CRC-scrambled)) using the interfering group identifier2620. In some examples, the downlink control information 2625 for eachUE in the interfering group of devices may be encoded (e.g., scrambled(e.g., CRC-scrambled)) using a deterministic function (e.g., an XOR) ofthe interfering group identifier 2620 and a UE identifier for the UE.For example, downlink control information for the second UE 2615-a maybe encoded (e.g., scrambled (e.g., CRC-scrambled)) using a deterministicfunction (e.g., an XOR) of the interfering group identifier 2620 and asecond UE identifier assigned to the second UE 2615-a to identify thesecond UE 2615-a within the interfering group of devices.

When the first base station 2605 is operating in an uplink subframeconfiguration when the downlink control information 2625 is transmitted,and at block 2630, the first base station 2605 may receive the downlinkcontrol information 2625. In some examples, the downlink controlinformation 2625 may be received in one or more PDCCHs or ePDCCHs. Insome examples, the downlink control information 2625 may be received forone or more UEs in the interfering group of devices using theinterfering group identifier 2620. For example, downlink controlinformation for the second UE 2615-a may be decoded (e.g., descrambled(e.g., CRC-descrambled)) using the interfering group identifier 2620. Insome examples, the downlink control information 2625 may be received forone or more UEs in the interfering group of devices by attempting toreceive downlink control information for each of the UEs represented inthe range of UE identifiers received for the interfering group ofdevices. For example, the downlink control information 2625 may bereceived for a UE in the interfering group of devices using adeterministic function (e.g., an XOR) of the interfering groupidentifier 2620 and a UE identifier for the UE. For example, downlinkcontrol information for the second UE 2615-a may be decoded (e.g.,descrambled (e.g., CRC-descrambled)) based at least in part on adeterministic function of the interfering group identifier 2620 and asecond UE identifier assigned to the second UE 2615-a to identify thesecond UE 2615-a within the interfering group of devices.

In examples in which the downlink control information for a UE isscrambled using the interfering group identifier 2620, the downlinkcontrol information for the UE may reference (e.g., include) a UEidentifier for the UE. Inclusion of the UE identifier, in the downlinkcontrol information for the UE, may enable the first base station 2605to identify the UE to which the downlink control informationcorresponds. In examples in which the downlink control information for aUE is scrambled using a deterministic function (e.g., an XOR) of theinterfering group identifier 2620 and a UE identifier, the downlinkcontrol information for the UE may not include a UE identifier, and thefirst base station 2605 may identify the UE to which the downlinkcontrol information corresponds based at least in part on an ability todecode (e.g., descramble (e.g., CRC-descramble)) the downlink controlinformation for the UE using the interfering group identifier 2620 andthe UE identifier for the UE.

At block 2635, the first base station 2605 may identify, based at leastin part on the downlink control information 2625, an interferingtransmission 2650. In some examples, the interfering transmission 2650may include a downlink data transmission (e.g., a PDSCH) transmittedfrom the second base station 2605-a to the second UE 2615-a. Theinterfering transmission 2650 may be considered interfering, in thecontext of the first base station 2605, because it has the potential tointerfere with the first base station's receipt of the uplinktransmission 2645. In some examples, the first base station 2605 mayfurther identify the interfering transmission 2650 based at least inpart on information that the first base station 2605 knows about theuplink transmission 2645 (e.g., by identifying an overlap of resourcesassigned to the uplink transmission 2645 and the interferingtransmission 2650). The first base station 2605 may process the downlinkcontrol information 2625 to determine, for example, a transmissionformat, a data rate, a rank, an MCS, assigned resource blocks, or HARQinformation for the interfering transmission 2650.

At block 2640, the first base station 2605 may determine an RNTI for theinterfering transmission 2650. The RNTI may be based at least in part ona second UE identifier included in the downlink control information2625. The second UE identifier may be an identifier of the second UE2615-a. In some examples, the RNTI for the interfering transmission 2650may be based at least in part on a deterministic function (e.g., an XOR)of the second UE identifier and the interfering group identifier 2620.

At some point in time following transmission of the downlink controlinformation 2625 (and in some examples, immediately following), thefirst base station 2605 may receive the uplink transmission 2645 (e.g.,a physical uplink control channel (PUCCH) or a physical uplink sharedchannel (PUSCH)) from the first UE 2615.

Overlapping with the uplink transmission 2645, the second base station2605-a may transmit the interfering transmission 2650 (e.g., a downlinkdata transmission (e.g., a PDSCH) transmitted to the second UE 2615-a),as indicated in the downlink control information 2625. In some examples,the interfering transmission 2650 may be scrambled using the determinedRNTI for the interfering transmission 2650.

At block 2655, the first base station 2605 may identify or decode theinterfering transmission 2650. In some examples, the interferingtransmission 2650 may be identified or decoded (e.g., descrambled) usingthe determined RNTI for the interfering transmission 2650.

At block 2660, the first base station 2605 may perform an interferencecancellation operation (e.g., a CWIC operation or a SLIC operation) onthe interfering transmission 2650. In some examples, the interferencecancellation operation may be performed on a per-resource block basis.

At block 2665, the first base station 2605 may identify or decode theuplink transmission 2645 (e.g., in the absence of the canceledinterfering transmission 2650).

In some examples of the message flow 2600, a plurality of interferingtransmissions may be identified and canceled by performing aninterference cancellation operation (or by performing a plurality ofinterference cancellation operations).

FIG. 27 shows a message flow 2700 between a first UE 2715, a second UE2715-a, a first base station 2705, and a second base station 2705-a, inaccordance with various aspects of the present disclosure. In someexamples, the first UE 2715 or the second UE 2715-a may be an example ofaspects of one or more of the UEs 115, 2015, 2015-a, 2015-b, 2015-c,2015-d, 2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315, 2315-a, 2415,2415-a, 2515, 2515-a, 2615, or 2615-a described with reference to FIG.1, 20, 22, 23, 24, 25, or 26. In some examples, the first base station2705 or the second base station 2705-a may be an example of aspects ofone or more of the base stations 105, 2005, 2005-a, 2005-b, 2005-c,2005-d, 2005-e, 2205, 2205-a, 2305, 2405, 2405-a, 2505, 2505-a, 2605, or2605-a described with reference to FIG. 1, 2, 4, 5, 6, 7, or 8. In someexamples, the first base station 2705 may operate as a serving basestation for the first UE 2715, and the second base station 2705-a mayoperate as a serving base station for the second UE 2715-a. Messages maybe transmitted between the first UE 2715, the second UE 2715-a, thefirst base station 2705, the or the second base station 2705-a over atleast one radio frequency spectrum band (e.g., a licensed radiofrequency spectrum band or an unlicensed radio frequency spectrum band).

As shown in FIG. 27, the second base station 2705-a may transmit aninterfering group identifier 2720 to the first base station 2705 or thefirst base station 2705 may otherwise acquire (e.g., request) theinterfering group identifier 2720. In some examples, the interferinggroup identifier 2720 may be transmitted from the second base station2705-a to the first base station 2705 over a backhaul link 134 (see,e.g., FIG. 1). Also or alternatively, the first base station 2705 maydecode a SIB received from the second base station 2705-a, and extractthe interfering group identifier 2720 from the SIB received from thesecond base station 2705-a. In some examples, the interfering groupidentifier 2720 may include an interfering group RNTI. The interferinggroup identifier may be associated with an interfering group of devices,such as a group of devices included in an RNTI group managed by thesecond base station 2705-a. In some examples, the interfering group ofdevices may include the second UE 2715-a. The second base station 2705-amay also be considered an interfering device, though not a member of theRNTI group including the interfering group of devices. One or more ofthe wireless devices in the interfering group of devices may receive aninterfering transmission from the second base station 2705-a, whichinterfering transmission interferes with the reception of transmissionsby the first base station 2705. For example, the second UE 2715-a mayreceive a transmission (e.g., the interfering transmission 2750) fromthe second base station 2705-a, which transmission from the second basestation 2705-a interferes with the reception of a transmission (e.g.,the uplink transmission 2745) from the first UE 2715 by the first basestation 2705.

In some examples, the second base station 2705-a may also transmit tothe first base station 2705 a range of UE identifiers included in theinterfering group of devices, or the first base station 2705 mayotherwise acquire (e.g., request) the range of UE identifiers.

The second base station 2705-a may transmit downlink control information2725 (e.g., one or more PDCCHs or ePDCCHs containing downlink controlinformation) to one or more of the UEs in the interfering group ofdevices (e.g., to the second UE 2715-a). In some examples, the downlinkcontrol information 2725 may include downlink control information foreach UE, in the interfering group of devices, with which the second basestation 2705-a intends to communicate during a subframe. In someexamples, the downlink control information 2725 may be encoded (e.g.,scrambled (e.g., CRC-scrambled)) using the interfering group identifier2720. In some examples, the downlink control information 2725 for eachUE in the interfering group of devices may be encoded (e.g., scrambled(e.g., CRC-scrambled)) using a deterministic function (e.g., an XOR) ofthe interfering group identifier 2720 and a UE identifier for the UE.For example, downlink control information for the second UE 2715-a maybe encoded (e.g., scrambled (e.g., CRC-scrambled)) using a deterministicfunction (e.g., an XOR) of the interfering group identifier 2720 and asecond UE identifier assigned to the second UE 2715-a to identify thesecond UE 2715-a within the interfering group of devices.

When the first base station 2705 is operating in an uplink subframeconfiguration when the downlink control information 2725 is transmitted,and at block 2730, the first base station 2705 may receive the downlinkcontrol information 2725. In some examples, the downlink controlinformation 2725 may be received in one or more PDCCHs or ePDCCHs. Insome examples, the downlink control information 2725 may be received forone or more UEs in the interfering group of devices using theinterfering group identifier 2720. For example, downlink controlinformation for the second UE 2715-a may be decoded (e.g., descrambled(e.g., CRC-descrambled)) using the interfering group identifier 2720. Insome examples, the downlink control information 2725 may be received forone or more UEs in the interfering group of devices by attempting toreceive downlink control information for each of the UEs represented inthe range of UE identifiers received for the interfering group ofdevices. For example, the downlink control information 2725 may bereceived for a UE in the interfering group of devices using adeterministic function (e.g., an XOR) of the interfering groupidentifier 2720 and a UE identifier for the UE. For example, downlinkcontrol information for the second UE 2715-a may be decoded (e.g.,descrambled (e.g., CRC-descrambled)) based at least in part on adeterministic function of the interfering group identifier 2720 and asecond UE identifier assigned to the second UE 2715-a to identify thesecond UE 2715-a within the interfering group of devices.

In examples in which the downlink control information for a UE isscrambled using the interfering group identifier 2720, the downlinkcontrol information for the UE may reference (e.g., include) a UEidentifier for the UE. Inclusion of the UE identifier, in the downlinkcontrol information for the UE, may enable the first base station 2705to identify the UE to which the downlink control informationcorresponds. In examples in which the downlink control information for aUE is scrambled using a deterministic function (e.g., an XOR) of theinterfering group identifier 2720 and a UE identifier, the downlinkcontrol information for the UE may not include a UE identifier, and thefirst base station 2705 may identify the UE to which the downlinkcontrol information corresponds based at least in part on an ability todecode (e.g., descramble (e.g., CRC-descramble)) the downlink controlinformation for the UE using the interfering group identifier 2720 andthe UE identifier for the UE.

At block 2735, the first base station 2705 may identify, based at leastin part on the information pertaining to at least one uplink assignment,an interfering transmission 2750. In some examples, the interferingtransmission 2750 may include an uplink transmission (e.g., a PUCCH or aPUSCH) transmitted from the second UE 2715-a to the second base station2705-a. The interfering transmission 2750 may be considered interfering,in the context of the first base station 2705, because it has thepotential to interfere with the first base station's receipt of theuplink transmission 2745. In some examples, the first base station 2705may further identify the interfering transmission 2750 based at least inpart on information that the first base station 2705 knows about theuplink transmission 2745 (e.g., by identifying an overlap of resourcesassigned to the uplink transmission 2745 and the interferingtransmission 2750). The first base station 2705 may process the downlinkcontrol information 2725 to determine, for example, a transmissionformat, a data rate, a rank, an MCS, assigned resource blocks, or HARQinformation for the interfering transmission 2750.

At block 2740, the first base station 2705 may determine an RNTI for theinterfering transmission 2750. The RNTI may be based at least in part ona second UE identifier included in the downlink control information2725. The second UE identifier may be an identifier of the second UE2715-a. In some examples, the RNTI for the interfering transmission 2750may be based at least in part on a deterministic function (e.g., an XOR)of the second UE identifier and the interfering group identifier 2720.

At some point in time following transmission of the downlink controlinformation 2725 (and in some examples, immediately following), thefirst base station 2705 may receive the uplink transmission 2745 (e.g.,a PUCCH or a PUSCH) from the first UE 2715.

Overlapping with the uplink transmission 2745, the second base station2705-a may transmit the interfering transmission 2750 (e.g., an uplinktransmission (e.g., a PUSCH or PDSCH) transmitted to the second UE2715-a), as indicated in the downlink control information 2725. In someexamples, the interfering transmission 2750 may be scrambled using thedetermined RNTI for the interfering transmission 2750.

At block 2755, the first base station 2705 may identify or decode theinterfering transmission 2750. In some examples, the interferingtransmission 2750 may be identified or decoded (e.g., descrambled) usingthe determined RNTI for the interfering transmission 2750.

At block 2760, the first base station 2705 may perform an interferencecancellation operation (e.g., a CWIC operation or a SLIC operation) onthe interfering transmission 2750. In some examples, the interferencecancellation operation may be performed on a per-resource block basis.

At block 2765, the first base station 2705 may identify or decode theuplink transmission 2745 (e.g., in the absence of the canceledinterfering transmission 2750).

In some examples of the message flow 2700, a plurality of interferingtransmissions may be identified and canceled by performing aninterference cancellation operation (or by performing a plurality ofinterference cancellation operations).

In some examples, a wireless communication system such as the wirelesscommunication system 100, 2000, or 2200 described with reference to FIG.20, 22, or 24 may include UEs capable of operating in an RNTI group(e.g., UEs capable of identifying that the UE has been assigned to anRNTI group) or decoding information pertaining to an interferingtransmission's relation to a device included in an interfering group ofdevices (e.g., an interfering RNTI group). The wireless communicationsystem may also include UEs that are not capable of operating in, orunderstanding information pertaining to, an RNTI group. When a basestation communicates with both RNTI group-capable UEs and legacy UEs(e.g., UEs that are not capable of operating in or understanding RNTIgroups), the RNTI group-capable UEs may be able to cancel interferencefrom transmissions to or from UEs included in an RNTI group, but may notbe able to cancel (or efficiently cancel) interference fromtransmissions to or from legacy UEs not included in an RNTI group. Abase station or group of base stations may separate the scheduling oftransmissions to or from RNTI group-capable UEs and legacy UEs in a timedomain multiplexed (TDM) or frequency domain multiplexed (FDM) manner.Also or alternatively, a base station may duplicate a PDCCH or ePDCCHfor a legacy UE in a PDCCH or ePDCCH for an RNTI group-capable UE. Alsoor alternatively, a flag may be included in the PDCCH or ePDCCH for anRNTI group-capable UE, which flag may indicate whether a legacy UE isscheduled during a subframe to which the PDCCH or ePDCCH applies. Theflag may indicate that a UE may need to use blind detection to detect aninterfering transmission to or from a legacy UE.

In some examples, the number of PDCCHs or ePDCCHs that a UE maypotentially decode may be high, and the processing burden that thisplaces on the UE may likewise be high. To reduce the processing burdenplaced on the UE, a search space for identifying control information maybe defined. In some examples, the search space may be defined by a hash,which hash is based on at least a UE identifier assigned to the UE. Thehash may be used to check a set of control channel elements for a match,such that the UE decodes (or attempts to decode) a limited number ofPDCCHs or ePDCCHs.

FIG. 28 shows a block diagram 2800 of a wireless apparatus 2805 for usein wireless communication, in accordance with various aspects of thepresent disclosure. In some examples, the wireless apparatus 2805 may bean example of aspects of one or more of the base stations 105, 2005,2005-a, 2005-b, 2005-c, 2005-d, 2005-e, 2205, 2205-a, 2305, 2405,2405-a, 2505, 2505-a, 2605, 2605-a, 2705, or 2705-a described withreference to FIG. 1, 20, 22, 23, 24, 25, 26, or 27. The wirelessapparatus 2805 may also be a processor. The wireless apparatus 2805 mayinclude a receiver module 2810, a wireless communication managementmodule 2820, or a transmitter module 2830. Each of these components maybe in communication with each other.

The components of the wireless apparatus 2805 may, individually orcollectively, be implemented using one or more Application-SpecificIntegrated Circuits (ASICs) adapted to perform some or all of theapplicable functions in hardware. Alternatively, the functions may beperformed by one or more other processing units (or cores), on one ormore integrated circuits. In other examples, other types of integratedcircuits may be used (e.g., Structured/Platform ASICs, FieldProgrammable Gate Arrays (FPGAs), and other Semi-Custom ICs), which maybe programmed in any manner known in the art. The functions of each unitmay also be implemented, in whole or in part, with instructions embodiedin a memory, formatted to be executed by one or more general orapplication-specific processors.

In some examples, the receiver module 2810 may include at least oneradio frequency (RF) receiver, such as at least one RF receiver operableto receive transmissions over at least one radio frequency spectrumband. In some examples, the at least one radio frequency spectrum bandmay be used for wireless communications, as described, for example, withreference to FIG. 1 or 22. The receiver module 2810 may be used toreceive various types of data or control signals (i.e., transmissions)over one or more communication links of a wireless communication system,such as one or more communication links of the wireless communicationsystem 100, 2000, or 2200 described with reference to FIG. 1, 20, or 22.

In some examples, the transmitter module 2830 may include at least oneRF transmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module2830 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100, 2000, or 2200 described withreference to FIG. 1, 20, or 22.

The wireless communication management module 2820 may be used to managesome or all of the wireless communications to or from the wirelessapparatus 2805. In some examples, the wireless communication managementmodule 2820 may include an RNTI management module 2835, a controlinformation formatting module 2840, or a data formatting module 2845.

In some examples, the RNTI management module 2835 may be used to defineone or more RNTI groups and assign each RNTI group a group identifier(e.g., a group RNTI). Each RNTI group may include a set of UEs served bythe wireless apparatus 2805. In some examples, the UEs in an RNTI groupmay utilize a new transmission mode (TM; e.g., TM13). In some examples,each group RNTI may be a 16-bit value.

In some examples, the RNTI management module 2835 may also be used toassign each of the UEs within an RNTI group a UE identifier (e.g., aunique identifier within the RNTI group). In some examples, each UEidentifier may be an 8-bit value.

In some examples, the RNTI management module 2835 may be used totransmit, to a UE served by the wireless apparatus 2805, one or more ofa UE identifier assigned to the UE, a group identifier of an RNTI groupto which the UE is assigned, a range of UE identifiers for an RNTI groupto which the UE is assigned, an interfering group identifier (e.g., anidentifier of an interfering group of devices), or a range of UEidentifiers for the interfering group of devices.

In some examples, the control information formatting module 2840 may beused to format, on a subframe basis, a PDCCH or ePDCCH for each UE thatthe wireless apparatus 2805 intends to communicate with during asubframe. Before transmission, each PDCCH or ePDCCH for a UE in a sameRNTI group may be encoded (e.g., scrambled (e.g., CRC-scrambled)) withthe group identifier for the RNTI group. Within each PDCCH or ePDCCH fora UE in an RNTI group, the control information formatting module 2840may format downlink control information (e.g., a field of the downlinkcontrol information) to reference the UE identifier assigned to the UEto which the PDCCH or ePDCCH corresponds. Alternatively, each PDCCH orePDCCH for a UE in a same RNTI group may be encoded (e.g., scrambled(e.g., CRC-scrambled)) using an RNTI based at least in part on adeterministic function (e.g., an XOR) of 1) the UE identifier to whichthe downlink control information corresponds, and 2) the groupidentifier for the RNTI group.

In some examples, the data formatting module 2845 may be used to format,on a subframe basis, a PDSCH corresponding to a PDCCH or ePDCCH. EachPDSCH corresponding to an RNTI group may be encoded (e.g., scrambled(e.g., CRC-scrambled)) using an RNTI based at least in part on adeterministic function (e.g., an XOR) of 1) the UE identifier for the UEto which the PDSCH is directed, and 2) the group identifier for the RNTIgroup.

In some examples, the wireless apparatus 2805 may perform theoperation(s) performed by one or more of the base stations 2305, 2405,2505, 2605, or 2705 described with reference to FIG. 23, 24, 25, 26, or27.

FIG. 29 shows a block diagram 2900 of a wireless apparatus 2915 for usein wireless communication, in accordance with various aspects of thepresent disclosure. In some examples, the wireless apparatus 2915 may bean example of aspects of one or more of the UEs 115, 2015, 2015-a,2015-b, 2015-c, 2015-d, 2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315,2315-a, 2415, 2415-a, 2515, 2515-a, 2615, 2615-a, 2715, or 2715-adescribed with reference to FIG. 1, 20, 22, 23, 24, 25, 26, or 27. Thewireless apparatus 2915 may also be a processor. The wireless apparatus2915 may include a receiver module 2910, a wireless communicationmanagement module 2920, or a transmitter module 2930. Each of thesecomponents may be in communication with each other.

The components of the wireless apparatus 2915 may, individually orcollectively, be implemented using one or more ASICs adapted to performsome or all of the applicable functions in hardware. Alternatively, thefunctions may be performed by one or more other processing units (orcores), on one or more integrated circuits. In other examples, othertypes of integrated circuits may be used (e.g., Structured/PlatformASICs, FPGAs, and other Semi-Custom ICs), which may be programmed in anymanner known in the art. The functions of each unit may also beimplemented, in whole or in part, with instructions embodied in amemory, formatted to be executed by one or more general orapplication-specific processors.

In some examples, the receiver module 2910 may include at least one RFreceiver, such as at least one RF receiver operable to receivetransmissions over at least one radio frequency spectrum band. In someexamples, the at least one radio frequency spectrum band may be used forwireless communications, as described, for example, with reference toFIG. 1 or 4. The receiver module 2910 may be used to receive varioustypes of data or control signals (i.e., transmissions) over one or morecommunication links of a wireless communication system, such as one ormore communication links of the wireless communication system 100, 2000,or 2200 described with reference to FIG. 1, 20, or 22.

In some examples, the transmitter module 2930 may include at least oneRF transmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module2930 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100, 2000, or 2200 described withreference to FIG. 1, 20, or 22.

The wireless communication management module 2920 may be used to managesome or all of the wireless communications to or from the wirelessapparatus 2915. In some examples, the wireless communication managementmodule 2920 may include an identifier (ID) management module 2935, acontrol information processing management module 2940, or a dataprocessing management module 2945.

In some examples, the ID management module 2935 may be used to manage agroup identifier, a UE identifier, or a range of UE identifiers receivedfrom a base station. The group identifier may be associated with a groupof devices (e.g., an RNTI group) including the wireless apparatus 2915and at least one other wireless device (e.g., at least one other UE).The UE identifier may be assigned to the wireless apparatus 2915 and mayidentify the first wireless apparatus 2915 within the first group ofdevices. The range of UE identifiers may correspond to the UEs includedin the group of devices (e.g., the RNTI group). In some examples, thegroup identifier, the UE identifier, or the range of UE identifiers maybe received by the wireless apparatus 2915 during a random accessprocedure. In some examples, the UE identifier may be static orsemi-static and may be transmitted from the wireless apparatus 2915 tothe base station.

In some examples, the control information processing management module2940 may be used to manage the receipt, decoding, or other processing ofdownlink control information for the first wireless apparatus 2915. Insome examples, the downlink control information may be included in aPDCCH or ePDCCH for the wireless apparatus 2915. In some examples, thecontrol information processing management module 2940 may manage receiptof the downlink control information for the wireless apparatus 2915using the group identifier managed by the ID management module 2935. Forexample, the control information processing management module 2940 maymanage a decoding (e.g., a descrambling (e.g., a CRC-descrambling)) ofthe downlink control information for the wireless apparatus 2915 usingthe group identifier. In some examples, the control informationprocessing management module 2940 may manage receipt of the downlinkcontrol information for the wireless apparatus 2915 using adeterministic function (e.g., an XOR) of the group identifier managed bythe ID management module 2935 and the UE identifier assigned to thewireless apparatus 2915. For example, the control information processingmanagement module 2940 may manage a decoding (e.g., a descrambling(e.g., a CRC-descrambling)) of the downlink control information for thewireless apparatus 2915 using a deterministic function of the groupidentifier and the UE identifier.

In some examples, the downlink control information for the wirelessapparatus 2915 may reference (e.g., include) the UE identifier assignedto the wireless apparatus 2915. Inclusion of the UE identifier assignedto the wireless apparatus 2915, in the downlink control information forthe wireless apparatus 2915, may enable the control informationprocessing management module 2940 to distinguish the downlink controlinformation for the wireless apparatus 2915 from downlink controlinformation for at least one other wireless device in a same group ofdevices (e.g., a same RNTI group), and thereby identify the downlinkcontrol information for the wireless apparatus 2915 based at least inpart on the UE identifier assigned to the wireless apparatus 2915. Forexample, the wireless apparatus 2915 may sometimes receive downlinkcontrol information for at least one other wireless device in the groupof devices, which downlink control information for the at least oneother device may also be decoded using a group identifier of an RNTIgroup to which the wireless apparatus 2915 belongs. However, because thedownlink control information for the at least one other wireless devicedoes not include the UE identifier assigned to the wireless apparatus2915, the control information processing management module 2940 maydetermine that the downlink control information for the at least oneother wireless device is not intended for the first wireless apparatus2915.

In some examples, the downlink control information for the wirelessapparatus 2915 may not reference the UE identifier assigned to thewireless apparatus 2915 (e.g., when the downlink control information forthe wireless apparatus 2915 is encoded (e.g., scrambled (e.g.,CRC-scrambled)) using a deterministic function of the group identifiermanaged by the RNTI management module 2835 and the UE identifierassigned to the wireless apparatus 2915. In these examples, the downlinkcontrol information for the wireless apparatus 2915 may be distinguishedfrom other downlink control information by the ability to decode thedownlink control information based at least in part on the deterministicfunction.

In some examples, the data processing management module 2945 may be usedto receive a transmission (e.g., a downlink data transmission, such as aPDSCH) from a base station using the downlink control information forthe wireless apparatus 2915.

In some examples, the wireless apparatus 2915 may perform theoperation(s) at one or more of the blocks 2340, 2345, or 2350 describedwith reference to FIG. 23.

FIG. 30 shows a block diagram 3000 of a wireless apparatus 3005 for usein wireless communication, in accordance with various aspects of thepresent disclosure. In some examples, the wireless apparatus 3005 may bean example of aspects of one or more of the UEs 115, 2015, 2015-a,2015-b, 2015-c, 2015-d, 2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315,2315-a, 2415, 2415-a, 2515, 2515-a, 2615, 2615-a, 2715, or 2715-adescribed with reference to FIG. 1, 20, 22, 23, 24, 25, 26, or 27,aspects of one or more of the base stations 105, 2005, 2005-a, 2005-b,2005-c, 2005-d, 2005-e, 2205, 2205-a, 2305, 2405, 2405-a, 2505, 2505-a,2605, 2605-a, 2705, or 2705 described with reference to FIG. 1, 20, 22,23, 24, 25, 26, or 27, or aspects of one or more of the wirelessapparatuses 2805 or 2915 described with reference to FIG. 28 or 29. Thewireless apparatus 3005 may also be a processor. The wireless apparatus3005 may include a receiver module 3010, a wireless communicationmanagement module 3020, or a transmitter module 3030. Each of thesecomponents may be in communication with each other.

The components of the wireless apparatus 3005 may, individually orcollectively, be implemented using one or more ASICs adapted to performsome or all of the applicable functions in hardware. Alternatively, thefunctions may be performed by one or more other processing units (orcores), on one or more integrated circuits. In other examples, othertypes of integrated circuits may be used (e.g., Structured/PlatformASICs, FPGAs, and other Semi-Custom ICs), which may be programmed in anymanner known in the art. The functions of each unit may also beimplemented, in whole or in part, with instructions embodied in amemory, formatted to be executed by one or more general orapplication-specific processors.

In some examples, the receiver module 3010 may include at least one RFreceiver, such as at least one RF receiver operable to receivetransmissions over at least one radio frequency spectrum band. In someexamples, the at least one radio frequency spectrum band may be used forwireless communications, as described, for example, with reference toFIG. 1 or 22. The receiver module 3010 may be used to receive varioustypes of data or control signals (i.e., transmissions) over one or morecommunication links of a wireless communication system, such as one ormore communication links of the wireless communication system 100, 2000,or 2200 described with reference to FIG. 1, 20, or 22.

In some examples, the transmitter module 3030 may include at least oneRF transmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module3030 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100, 2000, or 2200 described withreference to FIG. 1, 20, or 22.

The wireless communication management module 3020 may be used to managesome or all of the wireless communications to or from the wirelessapparatus 3005. In some examples, the wireless communication managementmodule 3020 may include an identifier (ID) management module 3035, acontrol information processing management module 3040, an interferencedetermination module 3045, or a data processing management module 3050.Operation of the various modules of the wireless communicationmanagement module 3020 are described below first in the context of thewireless apparatus 3005 being included in a UE, and second in thecontext of the wireless apparatus 3005 being included in a base station.

Turning now to examples in which the wireless communication managementmodule 3020 may be included in a UE, and in some examples, the IDmanagement module 3035 may be used to manage an interfering groupidentifier or a UE identifier received from one or more base stations.In some examples, the interfering group identifier may be associatedwith an interfering group of devices (e.g., an interfering group ofUEs), such as a group of devices included in an RNTI group managed by abase station other than a base station that operates as a serving basestation for the wireless apparatus 3005. In some examples, the wirelessapparatus 3005 may receive the interfering group identifier from aserving base station. In some examples, the wireless apparatus 3005 maydecode a SIB received from a base station other than a serving basestation, and extract the interfering group identifier from the SIBreceived from the base station other than a serving base station. Insome examples, one or more of the wireless devices in the interferinggroup of devices may receive an interfering transmission from a basestation other than a serving base station for the wireless apparatus3005, and the interfering transmission may interfere with the receptionof transmissions at the wireless apparatus 3005.

In some examples, the UE identifier may be assigned to the wirelessapparatus 3005 by a serving base station for the wireless apparatus3005. In some examples, the interfering group identifier or the UEidentifier may be received by the wireless apparatus 3005 during arandom access procedure. In some examples, the UE identifier may bestatic or semi-static and may be transmitted from the wireless apparatus3005 to the base station.

In some examples, the control information processing management module3040 may be used to manage the receipt, decoding, or other processing ofdownlink control information for the first wireless apparatus 3005, inaddition to the receipt, decoding, or other processing of downlinkcontrol information for one or more of the devices in the interferinggroup of devices. In some examples, the downlink control information maybe included in a PDCCH or ePDCCH for the wireless apparatus 3005, or ina PDCCH or ePDCCH for one or more of the devices in the interferinggroup of devices. In some examples, the control information processingmanagement module 3040 may manage the receipt of downlink controlinformation for the wireless apparatus 3005 using the UE identifiermanaged by the ID management module 3035. For example, the controlinformation processing management module 3040 may manage a decoding(e.g., a descrambling (e.g., a CRC-descrambling)) of the downlinkcontrol information for the wireless apparatus 3005 using the UEidentifier. In examples in which the wireless apparatus 3005 is part ofan RNTI group managed by a serving base station for the wirelessapparatus 3005, the control information processing management module3040 may manage receipt of the downlink control information for thewireless apparatus 3005 as described with reference to FIG. 29.

In some examples, the control information processing management module3040 may manage the receipt of downlink control information for a devicein the interfering group of devices using the interfering groupidentifier managed by the ID management module 3035. For example, thecontrol information processing management module 3040 may manage adecoding (e.g., a descrambling (e.g., a CRC-descrambling)) of thedownlink control information for a device in the interfering group ofdevices using the interfering group identifier. In some examples, thecontrol information processing management module 3040 may determine thewireless devices to which the downlink control information corresponds.In some examples, the downlink control information may be determined tocorrespond to a wireless device when it references (e.g., includes) a UEidentifier of the wireless device.

In some examples, the control information processing management module3040 may be used to perform the operations described with reference toblock 2440 or 2445 of FIG. 24 or block 2540 or 2550 of FIG. 25.

In some examples, the interference determination module 3045 may be usedto identify an interfering transmission based at least in part on thereceived downlink control information for a device in the interferinggroup of devices. In some examples, the interference determinationmodule 3045 may be used to perform the operations described withreference to block 2450 or 2455 of FIG. 24 or block 2555 or 2560 of FIG.25.

In some examples, the data processing management module 3050 may be usedto receive a transmission (e.g., a downlink data transmission, such as aPDSCH) from a base station using the downlink control information forthe wireless apparatus 3005. In some examples, the data processingmanagement module 3050 may include an interference cancellationmanagement module 3055. In some examples, the interference cancellationmanagement module 3055 may be used to perform an interferencecancellation operation on an interfering transmission identified by theinterference determination module 3045. In some examples, the dataprocessing management module 3050 may be used to perform the operationsdescribed with reference to block 2470 or 2480 of FIG. 24 or block 2575or 2585 of FIG. 25. In some examples, the interference cancellationmanagement module 3055 may be used to perform the operation(s) describedwith reference to block 2475 of FIG. 24 or block 2580 of FIG. 25.

Turning now to examples in which the wireless communication managementmodule 3020 may be included in a base station, and in some examples, theID management module 3035 may be used to manage an interfering groupidentifier or UE identifiers of UEs served by the wireless apparatus3005. In some examples, the interfering group identifier may beassociated with an interfering group of devices (e.g., an interferinggroup of UEs), such as a group of devices included in an RNTI groupmanaged by a base station other than the wireless apparatus 3005. Insome examples, the wireless apparatus 3005 may receive the interferinggroup identifier from another base station. In some examples, thewireless apparatus 3005 may decode a SIB received from another basestation, and extract the interfering group identifier from the SIBreceived from the other base station. In some examples, one or more ofthe wireless devices in the interfering group of devices may receive aninterfering transmission from a base station other than the wirelessapparatus 3005, and the interfering transmission may interfere with thereception of transmissions at the wireless apparatus 3005.

In some examples, the control information processing management module3040 may manage the receipt of downlink control information for a devicein the interfering group of devices using the interfering groupidentifier managed by the ID management module 3035. For example, thecontrol information processing management module 3040 may manage adecoding (e.g., a descrambling (e.g., a CRC-descrambling)) of thedownlink control information for a device in the interfering group ofdevices using the interfering group identifier. In some examples, thecontrol information processing management module 3040 may determine thewireless devices to which the downlink control information corresponds.In some examples, the downlink control information may be determined tocorrespond to a wireless device when it references (e.g., includes) a UEidentifier of the wireless device.

In some examples, the control information processing management module3040 may be used to perform the operations described with reference toblock 2630 of FIG. 26 or block 2730 of FIG. 27.

In some examples, the interference determination module 3045 may be usedto identify an interfering transmission based at least in part on thereceived downlink control information for a device in the interferinggroup of devices. In some examples, the interference determinationmodule 3045 may be used to perform the operations described withreference to block 2635 or 2640 of FIG. 26 or block 2735 or 2740 of FIG.27.

In some examples, the data processing management module 3050 may be usedto receive a transmission (e.g., an uplink transmission, such as a PUCCHor a PUSCH) from a UE for which the wireless apparatus 3005 operates asa serving base station. In some examples, the interference cancellationmanagement module 3055 may be used to perform an interferencecancellation operation on an interfering transmission identified by theinterference determination module 3045. In some examples, the dataprocessing management module 3050 may be used to perform the operationsdescribed with reference to block 2655 or 2665 of FIG. 26 or block 2755or 2765 of FIG. 27. In some examples, the interference cancellationmanagement module 3055 may be used to perform the operation(s) describedwith reference to block 2660 of FIG. 26 or block 2760 of FIG. 27.

In examples in which the wireless apparatus 3005 is included in a UE,the wireless apparatus 3005 may perform the operation(s) performed byone or more of the UEs 2315, 2415, or 2515 described with reference toFIG. 23, 24, or 25. In examples in which the wireless apparatus 3005 isincluded in a base station, the wireless apparatus 3005 may perform theoperation(s) performed by one or more of the base stations 2305, 2605 or2705 described with reference to FIG. 23, 26, or 27.

FIG. 31 shows a block diagram 3100 of a wireless apparatus 3115 for usein wireless communication, in accordance with various aspects of thepresent disclosure. In some examples, the wireless apparatus 3115 may bean example of aspects of one or more of the UEs 115, 2015, 2015-a,2015-b, 2015-c, 2015-d, 2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315,2315-a, 2415, 2415-a, 2515, 2515-a, 2615, 2615-a, 2715, or 2715-adescribed with reference to FIG. 1, 20, 2, 23, 24, 25, 26, or 27, oraspects of one or more of the wireless apparatuses 2915 or 12015described with reference to FIG. 29 or 30. The wireless apparatus 3115may also be a processor. The wireless apparatus 3115 may include areceiver module 3110, a wireless communication management module 3120,or a transmitter module 3130. Each of these components may be incommunication with each other.

The components of the wireless apparatus 3115 may, individually orcollectively, be implemented using one or more ASICs adapted to performsome or all of the applicable functions in hardware. Alternatively, thefunctions may be performed by one or more other processing units (orcores), on one or more integrated circuits. In other examples, othertypes of integrated circuits may be used (e.g., Structured/PlatformASICs, FPGAs, and other Semi-Custom ICs), which may be programmed in anymanner known in the art. The functions of each unit may also beimplemented, in whole or in part, with instructions embodied in amemory, formatted to be executed by one or more general orapplication-specific processors.

In some examples, the receiver module 3110 may include at least one RFreceiver, such as at least one RF receiver operable to receivetransmissions over at least one radio frequency spectrum band. In someexamples, the at least one radio frequency spectrum band may be used forwireless communications, as described, for example, with reference toFIG. 1 or 22. The receiver module 3110 may be used to receive varioustypes of data or control signals (i.e., transmissions) over one or morecommunication links of a wireless communication system, such as one ormore communication links of the wireless communication system 100, 2000,or 2200 described with reference to FIG. 1, 20, or 22.

In some examples, the transmitter module 3130 may include at least oneRF transmitter, such as at least one RF transmitter operable to transmitover at least one radio frequency spectrum band. The transmitter module3130 may be used to transmit various types of data or control signals(i.e., transmissions) over one or more communication links of a wirelesscommunication system, such as one or more communication links of thewireless communication system 100, 2000, or 2200 described withreference to FIG. 1, 20, or 22.

The wireless communication management module 3120 may be used to managesome or all of the wireless communications to or from the wirelessapparatus 3115. In some examples, the wireless communication managementmodule 3120 may include an identifier (ID) management module 3135, acontrol information processing management module 3140, an interferencedetermination module 3150, or a data processing management module 3165.

In some examples, the ID management module 3135 may be used to manage aninterfering group identifier or a UE identifier received from one ormore base stations. In some examples, the interfering group identifiermay be associated with an interfering group of devices (e.g., aninterfering group of UEs), such as a group of devices included in anRNTI group managed by a base station other than a base station thatoperates as a serving base station for the wireless apparatus 3115. Insome examples, the wireless apparatus 3115 may receive the interferinggroup identifier from a serving base station. In some examples, thewireless apparatus 3115 may decode a SIB received from a base stationother than a serving base station, and extract the interfering groupidentifier from the SIB received from the base station other than aserving base station. In some examples, one or more of the wirelessdevices in the interfering group of devices may receive an interferingtransmission from a base station other than a serving base station forthe wireless apparatus 3115, and the interfering transmission mayinterfere with the reception of transmissions at the wireless apparatus3115.

In some examples, the UE identifier may be assigned to the wirelessapparatus 3115 by a serving base station for the wireless apparatus3115. In some examples, the interfering group identifier or the UEidentifier may be received by the wireless apparatus 3115 during arandom access procedure. In some examples, the UE identifier may bestatic or semi-static and may be transmitted from the wireless apparatus3115 to the base station.

In some examples, the control information processing management module3140 may be used to manage the receipt, decoding, or other processing ofdownlink control information for the first wireless apparatus 3115, inaddition to the receipt, decoding, or other processing of downlinkcontrol information for one or more of the devices in the interferinggroup of devices. In some examples, the downlink control information maybe included in a PDCCH or ePDCCH for the wireless apparatus 3115, or ina PDCCH or ePDCCH for one or more of the devices in the interferinggroup of devices. In some examples, the control information processingmanagement module 3140 may manage the receipt of downlink controlinformation for the wireless apparatus 3115 using the UE identifiermanaged by the ID management module 3135. For example, the controlinformation processing management module 3140 may manage a decoding(e.g., a descrambling (e.g., a CRC-descrambling)) of the downlinkcontrol information for the wireless apparatus 3115 using the UEidentifier. In examples in which the wireless apparatus 3115 is part ofan RNTI group managed by a serving base station for the wirelessapparatus 3115, the control information processing management module3140 may manage receipt of the downlink control information for thewireless apparatus 3115 as described with reference to FIG. 29.

In some examples, the control information processing management module3140 may manage the receipt of downlink control information for a devicein the interfering group of devices using the interfering groupidentifier managed by the ID management module 3135. For example, thecontrol information processing management module 3140 may manage adecoding (e.g., a descrambling (e.g., a CRC-descrambling)) of thedownlink control information for a device in the interfering group ofdevices using the interfering group identifier. In some examples, thecontrol information processing management module 3140 may determine thewireless devices to which the downlink control information corresponds.In some examples, the downlink control information may be determined tocorrespond to a wireless device when it references (e.g., includes) a UEidentifier of the wireless device.

In some examples, the control information processing management module3140 may include a control information interference cancellationmanagement module 3145. In some examples, the control informationinterference cancellation management module 3145 may be used to cancelinterference attributable to downlink control information for a devicein the interfering group of devices (e.g., when the downlink controlinformation for the device in the interfering group of devicesinterferes with the wireless apparatus' receipt of downlink controlinformation for the wireless apparatus 3115).

In some examples, the control information processing management module3140 may be used to perform the operations described with reference toblock 2440 or 2445 of FIG. 24 or block 2540 or 2550 of FIG. 25. In someexamples, the control information interference cancellation managementmodule 3145 may be used to perform the operation(s) described withreference to block 2545 of FIG. 25.

In some examples, the interference determination module 3150 may be usedto identify an interfering transmission based at least in part on thereceived downlink control information for a device in the interferinggroup of devices. In some examples, the interference determinationmodule 3150 may include a control information interference determinationmodule 3155 or a data interference determination module 3160. In someexamples, the control information interference determination module 3155may make the interference determination described with reference toblock 2545 of FIG. 25. In some examples, the data interferencedetermination module 3160 may be used to perform the operationsdescribed with reference to block 2450 or 2455 of FIG. 24 or block 2555or 2560 of FIG. 25.

In some examples, the data processing management module 3165 may be usedto receive a transmission (e.g., a downlink data transmission, such as aPDSCH) from a base station using the downlink control information forthe wireless apparatus 3115. In some examples, the data processingmanagement module 3165 may include a data interference cancellationmanagement module 3170. In some examples, the data interferencecancellation management module 3170 may be used to perform aninterference cancellation operation on an interfering transmissionidentified by the data interference determination module 3160. In someexamples, the data processing management module 3165 may be used toperform the operations described with reference to block 2470 or 2480 ofFIG. 24 or block 2575 or 2585 of FIG. 25. In some examples, the datainterference cancellation management module 3170 may be used to performthe operation(s) described with reference to block 2475 of FIG. 24 orblock 2580 of FIG. 25.

FIG. 32 shows a block diagram 3200 of a UE 3215 for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. The UE 3215 may have various configurations and may beincluded or be part of a personal computer (e.g., a laptop computer, anetbook computer, a tablet computer, etc.), a cellular telephone, a PDA,a digital video recorder (DVR), an internet appliance, a gaming console,an e-reader, etc. The UE 3215 may, in some examples, have an internalpower supply (not shown), such as a small battery, to facilitate mobileoperation. In some examples, the UE 3215 may be an example of aspects ofone or more of the UEs 115, 2015, 2015-a, 2015-b, 2015-c, 2015-d,2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315, 2315-a, 2415, 2415-a, 2515,2515-a, 2615, 2615-a, 2715, or 2715-a described with reference to FIG.1, 20, 22, 23, 24, 25, 26, or 27, or aspects of one or more of thewireless apparatuses 2915, 3005, or 3115 described with reference toFIG. 29, 30, or 31. The UE 3215 may be configured to implement at leastsome of the UE or apparatus features and functions described withreference to FIG. 1, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, or 31.

The UE 3215 may include a UE processor module 3210, a UE memory module3220, at least one UE transceiver module (represented by UE transceivermodule(s) 3230), at least one UE antenna (represented by UE antenna(s)3240), or a UE wireless communication management module 3260. Each ofthese components may be in communication with each other, directly orindirectly, over one or more buses 3235.

The UE memory module 3220 may include random access memory (RAM) orread-only memory (ROM). The UE memory module 3220 may storecomputer-readable, computer-executable code 3225 containing instructionsthat are configured to, when executed, cause the UE processor module3210 to perform various functions described herein related to wirelesscommunication, RNTI transmission reception, or interference cancellationbased at least in part on an interfering group identifier (e.g., anidentifier of an RNTI group). Alternatively, the code 3225 may not bedirectly executable by the UE processor module 3210 but be configured tocause the UE 3215 (e.g., when compiled and executed) to perform variousof the functions described herein.

The UE processor module 3210 may include an intelligent hardware device(e.g., a central processing unit (CPU), a microcontroller, an ASIC,etc.). The UE processor module 3210 may process information receivedthrough the UE transceiver module(s) 3230 or information to be sent tothe UE transceiver module(s) 3230 for transmission through the UEantenna(s) 3240. The UE processor module 3210 may handle, alone or inconnection with the UE wireless communication management module 3260,various aspects of wireless communication for the UE 3215.

The UE transceiver module(s) 3230 may include a modem configured tomodulate packets and provide the modulated packets to the UE antenna(s)3240 for transmission, and to demodulate packets received from the UEantenna(s) 3240. The UE transceiver module(s) 3230 may, in someexamples, be implemented as one or more UE transmitter modules and oneor more separate UE receiver modules. The UE transceiver module(s) 3230may support communications in the first radio frequency spectrum band orthe second radio frequency spectrum band. The UE transceiver module(s)3230 may be configured to communicate bi-directionally, via the UEantenna(s) 3240, with one or more of the base stations 105, 2005,2005-a, 2005-b, 2005-c, 2005-d, 2005-e, 2205, 2205-a, 2305, 2405,2405-a, 2505, 2505-a, 2605, 2605-a, 2705, or 2705-a described withreference to FIG. 1, 20, 22, 23, 24, 25, 26, or 27, or aspects of one ormore of the wireless apparatuses 2805 or 3005 described with referenceto FIG. 28 or 30. While the UE 3215 may include a single UE antenna,there may be examples in which the UE 3215 may include multiple UEantennas 3240.

The UE state module 3250 may be used, for example, to manage transitionsof the UE 3215 between an RRC idle state and an RRC connected state, andmay be in communication with other components of the UE 3215, directlyor indirectly, over the one or more buses 3235. The UE state module3250, or portions of it, may include a processor, or some or all of thefunctions of the UE state module 3250 may be performed by the UEprocessor module 3210 or in connection with the UE processor module3210.

The UE wireless communication management module 3260 may be configuredto perform or control some or all of the features or functions describedwith reference to FIG. 1, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, or 31related to wireless communication, including some or all of the featuresor functions related to RNTI transmission reception or interferencecancellation based at least in part on an interfering group identifier(e.g., an identifier of an RNTI group). The UE wireless communicationmanagement module 3260, or portions of it, may include a processor, orsome or all of the functions of the UE wireless communication managementmodule 3260 may be performed by the UE processor module 3210 or inconnection with the UE processor module 3210. In some examples, the UEwireless communication management module 3260 may be an example of thewireless communication management module 2920, 3020, or 3120 describedwith reference to FIG. 29, 30, or 31.

FIG. 33 shows a block diagram 3300 of a base station 3305 (e.g., a basestation forming part or all of an eNB) for use in wirelesscommunication, in accordance with various aspects of the presentdisclosure. In some examples, the base station 3305 may be an example ofaspects of one or more of the base stations 105, 2005, 2005-a, 2005-b,2005-c, 2005-d, 2005-e, 2205, 2205-a, 2305, 2405, 2405-a, 2505, 2505-a,2605, 2605-a, 2705, or 2705-a described with reference to FIG. 1, 20,22, 23, 24, 25, 26, or 27, or aspects of one or more of the wirelessapparatuses 2805 or 3005 described with reference to FIG. 28 or 30. Thebase station 3305 may be configured to implement or facilitate at leastsome of the base station or device features and functions described withreference to FIG. 1, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, or 31.

The base station 3305 may include a base station processor module 3310,a base station memory module 3320, at least one base station transceivermodule (represented by base station transceiver module(s) 3350), atleast one base station antenna (represented by base station antenna(s)3355), or a base station wireless communication management module 3360.The base station 3305 may also include one or more of a base stationcommunications module 3330 or a network communications module 3340. Eachof these components may be in communication with each other, directly orindirectly, over one or more buses 3335.

The base station memory module 3320 may include RAM or ROM. The basestation memory module 3320 may store computer-readable,computer-executable code 3325 containing instructions that areconfigured to, when executed, cause the base station processor module3310 to perform various functions described herein related to wirelesscommunication, RNTI group management or transmissions, or interferencecancellation based at least in part on an interfering group identifier(e.g., an identifier of an RNTI group). Alternatively, the code 3325 maynot be directly executable by the base station processor module 3310 butbe configured to cause the base station 3305 (e.g., when compiled andexecuted) to perform various of the functions described herein.

The base station processor module 3310 may include an intelligenthardware device, e.g., a CPU, a microcontroller, an ASIC, etc. The basestation processor module 3310 may process information received throughthe base station transceiver module(s) 3350, the base stationcommunications module 3330, or the network communications module 3340.The base station processor module 3310 may also process information tobe sent to the transceiver module(s) 3350 for transmission through theantenna(s) 3355, to the base station communications module 3330, fortransmission to one or more other base stations 105-d and 105-e, or tothe network communications module 3340 for transmission to a corenetwork 3345, which may be an example of one or more aspects of the corenetwork 130 described with reference to FIG. 1. The base stationprocessor module 3310 may handle, alone or in connection with the basestation wireless communication management module 3360, various aspectsof wireless communication for the base station 3305.

The base station transceiver module(s) 3350 may include a modemconfigured to modulate packets and provide the modulated packets to thebase station antenna(s) 3355 for transmission, and to demodulate packetsreceived from the base station antenna(s) 3355. The base stationtransceiver module(s) 3350 may, in some examples, be implemented as oneor more base station transmitter modules and one or more separate basestation receiver modules. The base station transceiver module(s) 3350may support communications in the one or more radio frequency spectrumbands. The base station transceiver module(s) 3350 may be configured tocommunicate bi-directionally, via the antenna(s) 3355, with one or moreUEs or other wireless apparatuses, such as one or more of the UEs 115,2015, 2015-a, 2015-b, 2015-c, 2015-d, 2015-e, 2215, 2215-a, 2215-b,2215-c, 2315, 2315-a, 2415, 2415-a, 2515, 2515-a, 2615, 2615-a, 2715,2715-a, or 3215 described with reference to FIG. 1, 20, 22, 23, 24, 25,26, 27, or 32, or one or more of the apparatuses 2915, 3005, or 3115described with reference to FIG. 29, 30, or 31. The base station 3305may, for example, include multiple base station antennas 3355 (e.g., anantenna array). The base station 3305 may communicate with the corenetwork 3345 through the network communications module 3340. The basestation 3305 may also communicate with other base stations, such as thebase stations 3305-a and 3305-b, using the base station communicationsmodule 3330.

The base station wireless communication management module 3360 may beconfigured to perform or control some or all of the features orfunctions described with reference to FIG. 1, 20, 21, 22, 23, 24, 25,26, 27, 28, 30, or 31 related to wireless communication, including someor all of the features or functions related to RNTI group management ortransmissions or interference cancellation based at least in part on aninterfering group identifier (e.g., an identifier of an RNTI group). Thebase station wireless communication management module 3360, or portionsof it, may include a processor, or some or all of the functions of thebase station wireless communication management module 3360 may beperformed by the base station processor module 3310 or in connectionwith the base station processor module 3310. In some examples, the basestation wireless communication management module 3360 may be an exampleof the wireless communication management module 2820, 3020, or 3120described with reference to FIG. 28, 30, or 31.

FIG. 34 is a flow chart illustrating an example of a method 3400 forwireless communication, in accordance with various aspects of thepresent disclosure. For clarity, the method 3400 is described below withreference to aspects of one or more of the UEs 115, 2015, 2015-a,2015-b, 2015-c, 2015-d, 2015-e, 2215, 2215-a, 2215-b, 2215-c, 2315,2315-a, 2415, 2415-a, 2515, 2515-a, 2615, 2615-a, 2715, 2715-a, or 3215,described with reference to FIG. 1, 20-27, or 32, or aspects of thewireless apparatus 2915 described with reference to FIG. 29. In someexamples, a UE or wireless apparatus may execute one or more sets ofcodes to control the functional elements of the UE or wireless apparatusto perform the functions described below. Additionally or alternatively,the UE or wireless apparatus may perform one or more of the functionsdescribed below using special-purpose hardware.

At block 3405, the method 3400 may include receiving, from a basestation and by a first wireless device (e.g., by a UE), at least one ofa first group identifier or a first UE identifier. The first groupidentifier may be associated with a first group of devices (e.g., anRNTI group) including the first wireless device and at least one otherwireless device (e.g., at least a second wireless device). The first UEidentifier may be assigned to the first wireless device and may identifythe first wireless device within the first group of devices. In someexamples, the operation(s) at block 3405 may further include receiving arange of UE identifiers associated with the first group of devices. Therange of UE identifiers may include the first UE identifier and at leasta second UE identifier. The second UE identifier may identify the secondUE. In some examples, the first group identifier, the first UEidentifier, or the range of UE identifiers may be received during arandom access procedure. In some examples, the first UE identifier maybe static or semi-static and may be transmitted from the first wirelessdevice to the base station. The operation(s) at block 3405 may beperformed using the wireless communication management module 2920, or3260, described with reference to FIG. 29, or 32, or the ID managementmodule 2935 described with reference to FIG. 29.

At block 3410, the method 3400 may include receiving, from the basestation and by the first wireless device, downlink control informationfor the first wireless device. In some examples, the downlink controlinformation may be included in a PDCCH or ePDCCH for the first wirelessdevice. In some examples, the downlink control information for the firstwireless device may be received using the first group identifier. Forexample, the downlink control information for the first wireless devicemay be decoded (e.g., descrambled (e.g., CRC-descrambled)) using thefirst group identifier. In some examples, the downlink controlinformation for the first wireless device may be received using adeterministic function (e.g., an XOR) of the first group identifier andthe first UE identifier. For example, the downlink control informationmay be decoded (e.g., descrambled (e.g., CRC-descrambled)) based atleast in part on a deterministic function of the group identifier andthe first UE identifier. The operation(s) at block 3410 may be performedusing the wireless communication management module 2920, or 3260described with reference to FIG. 29 or 32, or the control informationprocessing management module 2940 described with reference to FIG. 29.

In examples in which the downlink control information for a UE isscrambled using the first group identifier, the downlink controlinformation for the first wireless device may reference (e.g., include)the first UE identifier. Inclusion of the first UE identifier, in thedownlink control information for the first wireless device, may enablethe first wireless device to distinguish the downlink controlinformation for the first wireless device from downlink controlinformation for at least one other wireless device in the first group ofdevices, and thereby identify the downlink control information for thefirst wireless device based at least in part on the first UE identifier.For example, the first wireless device may sometimes receive downlinkcontrol information for at least one other wireless device in the firstgroup of devices, which downlink control information for the at leastone other device may also be decoded using the first group identifier.However, because the downlink control information for the at least oneother wireless device does not reference (e.g., include) the first UEidentifier, the first wireless device may determine that the downlinkcontrol information for the at least one other wireless device is notintended for the first wireless device. In examples in which thedownlink control information for a UE is scrambled using a deterministicfunction (e.g., an XOR) of the first group identifier and a UEidentifier, the downlink control information may not include the UEidentifier, and the first wireless device may identify the downlinkcontrol information for the first wireless device based at least in parton an ability to decode (e.g., descramble (e.g., CRC-descramble)) thedownlink control information for the first wireless device.

At block 3415, the method 3400 may include receiving a transmission(e.g., a downlink data transmission, such as a PDSCH) from the basestation (e.g., another wireless device) using the downlink controlinformation for the first wireless device. The operation(s) at block3410 may be performed using the wireless communication management module2920 or 3260 described with reference to FIG. 29 or 32, or the dataprocessing management module 2945 described with reference to FIG. 29.

In some examples, the method 3400 may further include identifying thetransmission from the base station using an RNTI based at least in parton the first UE identifier received at block 3405. In some examples, theRNTI may be based at least in part on a deterministic function (e.g., anXOR) of the first UE identifier and the first group identifier.

In some configurations of the method 3400, the first wireless device mayinclude the first UE 2315 described with reference to FIG. 23, and thebase station may include the base station 2305 described with referenceto FIG. 23. In these configurations, the downlink control informationmay in some examples include the downlink control information 2335. Alsoor alternatively, the downlink data transmission received from the basestation may include the first downlink data transmission 2350.

Thus, the method 3400 may provide for wireless communication. It shouldbe noted that the method 3400 is just one implementation and that theoperations of the method 3400 may be rearranged or otherwise modifiedsuch that other implementations are possible.

FIG. 35 is a flow chart illustrating an example of a method 3500 forwireless communication, in accordance with various aspects of thepresent disclosure. For clarity, example configurations of the method3500 are described below with reference to aspects of one or more of theUEs 115, 2015, 2015-a, 2015-b, 2015-c, 2015-d, 2015-e, 2215, 2215-a,2215-b, 2215-c, 2315, 2315-a, 2415, 2415-a, 2515, 2515-a, 2615, 2615-a,2715, 2715-a, 3215, or 1615 described with reference to FIG. 1, 20-27,32, or 34, aspects of one or more of the base stations 105, 2005,2005-a, 2005-b, 2005-c, 2005-d, 2005-e, 2205, 2205-a, 2305, 2405,2405-a, 2505, 2505-a, 2605, 2605-a, 2705, 2705-a, 3305, or 3405described with reference to FIG. 1, 20, 22, 23, 24, 25, 26, 27, 33, or34, or aspects of one or more of the wireless apparatuses 3005 or 3115described with reference to FIG. 30 or 13. In some examples, a UE, basestation, or wireless apparatus may execute one or more sets of codes tocontrol the functional elements of the UE, base station, or wirelessapparatus to perform the functions described below. Additionally oralternatively, the UE, base station, or wireless apparatus may performone or more of the functions described below using special-purposehardware.

At block 3505, the method 3500 may include receiving, by a firstwireless device, control information for at least a second wirelessdevice. In some examples, the control information may be received usingan interfering group identifier associated with an interfering group ofdevices. For example, control information for the second wireless devicemay be decoded (e.g., descrambled (e.g., CRC-descrambled)) using theinterfering group identifier. The interfering group of devices may beconsidered interfering because one or more of the wireless devices inthe group may receive or transmit transmissions that interfere with thereception or transmission of transmissions by the first wireless device.The interfering group of devices may include at least the secondwireless device. In some examples, the control information may bereceived in one or more PDCCHs or ePDCCHs containing the controlinformation. The operation(s) at block 3505 may be performed using thewireless communication management module 3020, 3120, 3260, 3360, 3484,or 3486 described with reference to FIG. 30, 31, 32, 33, or 34, or thecontrol information processing management module 3040 or 3140 describedwith reference to FIG. 30 or 31.

At block 3510, the method 3500 may include identifying an interferingtransmission based at least in part on the received control informationfor at least the second wireless device. The operation(s) at block 3510may be performed using the wireless communication management module3020, 3120, 3260, 3360, 1684, or 1686 described with reference to FIG.30, 31, 32, 33, or 34, the interference determination module 3045 or3150 described with reference to FIG. 30 or 31, or the data interferencedetermination module 3160 described with reference to FIG. 31.

At block 3515, the method 3500 may include performing interferencecancellation by the first wireless device on the identified interferingtransmission to receive a transmission from a third wireless device. Theoperation(s) at block 3515 may be performed using the wirelesscommunication management module 3020, 3120, 3260, 3360, 3484, or 3486described with reference to FIG. 30, 31, 32, 33, or 34, or theinterference cancellation management module 3055 or 3170 described withreference to FIG. 30 or 31.

In some examples, each of the at least second wireless device mayinclude a UE, and each of the at least second wireless device may beassigned a UE identifier that identifies the wireless device within theinterfering group of devices (e.g., the second wireless device may beassigned a second UE identifier). In these examples, a base stationserving the interfering group of devices may transmit (eitherproactively or upon request) a range of UE identifiers associated withthe interfering group of devices. The range of UE identifiers mayinclude the second UE identifier. The method 3500 may then include thefirst wireless device receiving the range of UE identifiers (e.g., fromthe base station serving the interfering group of devices, or from aserving base station of the first wireless device, which serving basestation of the first wireless device has already acquired the range ofUE identifiers). Receiving, by the first wireless device, controlinformation for at least the second wireless device may then includeattempting to receive control information for each of the UEsrepresented in the range of UE identifiers based at least in part ondeterministic functions (e.g., XORs) of the interfering group identifierand ones of the UE identifiers in the range of UE identifiers. Forexample, control information for the second wireless device may bedecoded (e.g., descrambled (e.g., CRC-descrambled)) based at least inpart on a deterministic function (e.g., an XOR) of the interfering groupidentifier and the second UE identifier.

In some examples of the method 3500, the first wireless device mayreceive the interfering group identifier from a base station. In someexamples, the base station may include the third wireless device. Insome examples, the first wireless device may receive the interferinggroup identifier during a random access procedure.

In some examples, the method 3500 may include identifying thetransmission from the third wireless device using an RNTI based at leastin part on a UE identifier assigned to the first wireless device. Insome examples, the method 3500 may include identifying the transmissionfrom the third wireless device using an RNTI based at least in part on adeterministic function (e.g., an XOR) of a UE identifier assigned to thefirst wireless device and a first group identifier associated with afirst group of devices including the first wireless device.

In some examples of the method 3500, receiving the control informationfor at least the second wireless device may include receiving alldownlink control information associated with the interfering group ofdevices. The downlink control information associated with theinterfering group of devices may be received using the interfering groupidentifier.

In some examples of the method 3500, the control information for thesecond wireless device may include an identifier assigned to the secondwireless device within the interfering group. In some of these examples,the interfering transmission may be identified using an RNTI based atleast in part on the identifier assigned to the second wireless devicewithin the interfering group. In other examples, the interferingtransmission may be identified based at least in part on a deterministicfunction of (e.g., an XOR of) the identifier assigned to the secondwireless device and the interfering group identifier.

In some examples, the method 3500 may include receiving, with thecontrol information for at least the second wireless device, anindication of whether a legacy device transmission is scheduled for asame subframe as the transmission from the third wireless device or theinterfering transmission.

In some configurations of the method 3500, the first wireless device mayinclude the UE 2415 described with reference to FIG. 24, the secondwireless device may include the second UE 2415-a described withreference to FIG. 24, and the third wireless device may include thefirst base station 2405 described with reference to FIG. 24. In theseconfigurations, the interfering transmission may in some examplesinclude a downlink data transmission, such as the interferingtransmission 2465. Also or alternatively, the transmission received fromthe third wireless device may include a downlink data transmission, suchas the first downlink data transmission 2460.

In some configurations of the method 3500, the first wireless device mayinclude the UE 2515 described with reference to FIG. 25, the secondwireless device may include the second UE 2515-a described withreference to FIG. 7, and the third wireless device may include the firstbase station 2505 described with reference to FIG. 25. In theseconfigurations, the interfering transmission may in some examplesinclude a downlink transmission, which downlink transmission may includecontrol information (as in the downlink control information 2535) ordata (as in the interfering transmission 2570). Also or alternatively,the transmission received from the third wireless device may include adownlink transmission, which downlink transmission may include controlinformation (as in the downlink control information 2530) or data (as inthe first downlink data transmission 2565).

In some configurations of the method 3500, the first wireless device mayinclude the first base station 2605 described with reference to FIG. 26,the second wireless device may include the second UE 2615-a describedwith reference to FIG. 26, and the third wireless device may include thefirst UE 2615 described with reference to FIG. 26. In theseconfigurations, the interfering transmission may in some examplesinclude a downlink data transmission (e.g., the interfering transmission2650). Also or alternatively, the transmission received from the thirdwireless device may include an uplink transmission (e.g., the uplinktransmission 2645).

In some configurations of the method 3500, the first wireless device mayinclude the first base station 2705 described with reference to FIG. 27,the second wireless device may include the second UE 2715-a describedwith reference to FIG. 27, and the third wireless device may include thefirst UE 2715 described with reference to FIG. 27. In theseconfigurations, the interfering transmission may in some examplesinclude an uplink transmission (e.g., the interfering transmission2750). Also or alternatively, the transmission received from the thirdwireless device may include an uplink transmission (e.g., the uplinktransmission 2745).

In some examples of the method 3500, the first wireless device mayperform the method 3400 described with reference to FIG. 34 to receivethe transmission from the third wireless device.

Thus, the method 3500 may provide for wireless communication. It shouldbe noted that the method 3500 is just one implementation and that theoperations of the method 3500 may be rearranged or otherwise modifiedsuch that other implementations are possible.

Techniques described herein may be used for various wirelesscommunications systems such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, andother systems. The terms “system” and “network” are often usedinterchangeably. A CDMA system may implement a radio technology such asCDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releases 0 and Aare commonly referred to as CDMA2000 1×, 1×, etc. IS-856 (TIA-856) iscommonly referred to as CDMA2000 1×EV-DO, High Rate Packet Data (HRPD),etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. ATDMA system may implement a radio technology such as Global System forMobile Communications (GSM). An OFDMA system may implement a radiotechnology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA),IEEE 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM™, etc.UTRA and E-UTRA are part of Universal Mobile Telecommunication System(UMTS). 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are newreleases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, andGSM are described in documents from an organization named “3rdGeneration Partnership Project” (3GPP). CDMA2000 and UMB are describedin documents from an organization named “3rd Generation PartnershipProject 2” (3GPP2). The techniques described herein may be used for thesystems and radio technologies mentioned above as well as other systemsand radio technologies, including cellular (e.g., LTE) communicationsover an unlicensed or shared bandwidth. The description above, however,describes an LTE/LTE-A system for purposes of example, and LTEterminology is used in much of the description above, although thetechniques are applicable beyond LTE/LTE-A applications.

The detailed description set forth above in connection with the appendeddrawings describes examples and does not represent all of the examplesthat may be implemented or that are within the scope of the claims. Theterms “example” and “exemplary,” when used in this description, mean“serving as an example, instance, or illustration,” and not “preferred”or “advantageous over other examples.” The detailed description includesspecific details for the purpose of providing an understanding of thedescribed techniques. These techniques, however, may be practicedwithout these specific details. In some instances, well-known structuresand apparatuses are shown in block diagram form in order to avoidobscuring the concepts of the described examples.

Information and signals may be represented using any of a variety ofdifferent technologies and techniques. For example, data, instructions,commands, information, signals, bits, symbols, and chips that may bereferenced throughout the above description may be represented byvoltages, currents, electromagnetic waves, magnetic fields or particles,optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connectionwith the disclosure herein may be implemented or performed with ageneral-purpose processor, a digital signal processor (DSP), an ASIC, anFPGA or other programmable logic device, discrete gate or transistorlogic, discrete hardware components, or any combination thereof designedto perform the functions described herein. A general-purpose processormay be a microprocessor, but in the alternative, the processor may beany conventional processor, controller, microcontroller, or statemachine. A processor may also be implemented as a combination ofcomputing devices, e.g., a combination of a DSP and a microprocessor,multiple microprocessors, one or more microprocessors in conjunctionwith a DSP core, or any other such configuration.

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on anon-transitory computer-readable medium. Other examples andimplementations are within the scope and spirit of the disclosure andappended claims. For example, due to the nature of software, functionsdescribed above can be implemented using software executed by aprocessor, hardware, firmware, hardwiring, or combinations of any ofthese. Features implementing functions may also be physically located atvarious positions, including being distributed such that portions offunctions are implemented at different physical locations. As usedherein, including in the claims, the term “or,” when used in a list oftwo or more items, means that any one of the listed items can beemployed by itself, or any combination of two or more of the listeditems can be employed. For example, if a composition is described ascontaining components A, B, or C, the composition can contain A alone; Balone; C alone; A and B in combination; A and C in combination; B and Cin combination; or A, B, and C in combination. Also, as used herein,including in the claims, “or” as used in a list of items (for example, alist of items prefaced by a phrase such as “at least one of” or “one ormore of”) indicates a disjunctive list such that, for example, a list of“at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC(i.e., A and B and C).

Computer-readable media includes both computer storage media andcommunication media including any medium that facilitates transfer of acomputer program from one place to another. A storage medium may be anyavailable medium that can be accessed by a general purpose or specialpurpose computer. By way of example, and not limitation,computer-readable media can comprise RAM, ROM, EEPROM, flash memory,CD-ROM or other optical disk storage, magnetic disk storage or othermagnetic storage devices, or any other medium that can be used to carryor store desired program code means in the form of instructions or datastructures and that can be accessed by a general-purpose orspecial-purpose computer, or a general-purpose or special-purposeprocessor. Also, any connection is properly termed a computer-readablemedium. For example, if the software is transmitted from a website,server, or other remote source using a coaxial cable, fiber optic cable,twisted pair, digital subscriber line (DSL), or wireless technologiessuch as infrared, radio, and microwave, then the coaxial cable, fiberoptic cable, twisted pair, DSL, or wireless technologies such asinfrared, radio, and microwave are included in the definition of medium.Disk and disc, as used herein, include compact disc (CD), laser disc,optical disc, digital versatile disc (DVD), floppy disk and Blu-ray discwhere disks usually reproduce data magnetically, while discs reproducedata optically with lasers. Combinations of the above are also includedwithin the scope of computer-readable media.

The previous description of the disclosure is provided to enable aperson skilled in the art to make or use the disclosure. Variousmodifications to the disclosure will be readily apparent to thoseskilled in the art, and the generic principles defined herein may beapplied to other variations without departing from the scope of thedisclosure. Thus, the disclosure is not to be limited to the examplesand designs described herein but is to be accorded the broadest scopeconsistent with the principles and novel features disclosed herein.

What is claimed is:
 1. A method for wireless communication, comprising: receiving downlink control information for a first user equipment (UE) based at least in part on a group identifier associated with a non-orthogonal multiple access (NOMA) group comprising the first UE and at least a second UE; and receiving a set of NOMA downlink transmissions at the first UE based at least in part on the downlink control information for the first UE.
 2. The method of claim 1, wherein the downlink control information for the first UE is received based at least in part on a deterministic function of the group identifier and a UE identifier assigned to the first UE.
 3. The method of claim 1, wherein the downlink control information for the first UE references a first UE identifier assigned to the first UE.
 4. The method of claim 3, further comprising: identifying, in the set of NOMA downlink transmissions, a first downlink transmission for the first UE using a first radio network temporary identifier (RNTI) based at least in part on the first UE identifier.
 5. The method of claim 3, wherein the first RNTI is based at least in part on a deterministic function of the first UE identifier and the group identifier.
 6. The method of claim 1, further comprising: receiving downlink control information for at least the second UE based at least in part on the group identifier associated with the NOMA group.
 7. The method of claim 6, wherein receiving the downlink control information for the second UE comprises: receiving the downlink control information for the second UE based at least in part on a deterministic function of the group identifier and a second UE identifier assigned to the second UE.
 8. The method of claim 6, further comprising: determining, based at least in part on the downlink control information for the first UE and the downlink control information for at least the second UE, that an interfering transmission overlaps a downlink transmission for the first UE.
 9. The method of claim 8, further comprising: performing an interference cancellation operation on the interfering transmission based at least in part on the downlink control information for at least the second UE.
 10. The method of claim 9, wherein the downlink control information for at least the second UE references a second UE identifier assigned to the second UE, and wherein the interference cancellation operation is performed using a second radio network temporary identifier (RNTI) based at least in part on the second UE identifier.
 11. The method of claim 10, wherein the second RNTI is based at least in part on a deterministic function of the second UE identifier and the group identifier.
 12. The method of claim 6, wherein receiving the downlink control information for at least the second UE comprises: receiving all downlink control information associated with the NOMA group based at least in part on the group identifier.
 13. The method of claim 1, further comprising: receiving downlink control information for the second UE based at least in part on an indication of the second UE, wherein the downlink control information for the first UE comprises the indication; and wherein receiving the set of NOMA downlink transmissions is based at least in part on the downlink control information for the second UE.
 14. An apparatus for wireless communication, comprising: a processor; memory coupled to the processor, wherein the processor is configured to: receive downlink control information for a first user equipment (UE) based at least in part on a group identifier associated with a non-orthogonal multiple access (NOMA) group comprising the first UE and at least a second UE; and receive a set of NOMA downlink transmissions at the first UE based at least in part on the downlink control information for the first UE.
 15. The apparatus of claim 14, wherein the downlink control information for the first UE is received based at least in part on a deterministic function of the group identifier and a UE identifier assigned to the first UE.
 16. The apparatus of claim 14, wherein the downlink control information for the first UE references a first UE identifier assigned to the first UE.
 17. The apparatus of claim 16, wherein the processor is configured to: identify, in the set of NOMA downlink transmissions, a first downlink transmission for the first UE using a first radio network temporary identifier (RNTI) based at least in part on the first UE identifier.
 18. The apparatus of claim 14, wherein the processor is configured to: receive downlink control information for at least the second UE based at least in part on the group identifier associated with the NOMA group.
 19. The apparatus of claim 18, wherein the processor is configured to: determine, based at least in part on the downlink control information for the first UE and the downlink control information for at least the second UE, that an interfering transmission overlaps a downlink transmission for the first UE.
 20. The apparatus of claim 19, wherein the processor is configured to: perform an interference cancellation operation on the interfering transmission based at least in part on the downlink control information for at least the second UE.
 21. The apparatus of claim 20, wherein the downlink control information for at least the second UE references a second UE identifier assigned to the second UE.
 22. The apparatus of claim 21, wherein the interference cancellation operation is performed using a second radio network temporary identifier (RNTI) based at least in part on the second UE identifier.
 23. The apparatus of claim 14, wherein the processor is configured to: receive downlink control information for the second UE based at least in part on an indication of the second UE, wherein the downlink control information for the first UE comprises the indication; and wherein receiving the set of NOMA downlink transmissions is based at least in part on the downlink control information for the second UE.
 24. The apparatus of claim 22, wherein the second RNTI is based at least in part on a deterministic function of the second UE identifier and the group identifier.
 25. An apparatus for wireless communication, comprising: means for receiving downlink control information for a first user equipment (UE) based at least in part on a group identifier associated with a non-orthogonal multiple access (NOMA) group comprising the first UE and at least a second UE; and means for receiving a set of NOMA downlink transmissions at the first UE based at least in part on the downlink control information for the first UE.
 26. The apparatus of claim 25, wherein the means for receiving the downlink control information for the first UE comprises: means for receiving the downlink control information for the first UE based at least in part on a deterministic function of the group identifier and a UE identifier assigned to the first UE.
 27. The apparatus of claim 25, wherein the downlink control information for the first UE references a first UE identifier assigned to the first UE.
 28. The apparatus of claim 25, further comprising: means for receiving downlink control information for at least the second UE based at least in part on the group identifier associated with the NOMA group.
 29. The apparatus of claim 28, wherein the means for receiving the downlink control information for the second UE comprises: means for receiving the downlink control information for the second UE based at least in part on a deterministic function of the group identifier and a second UE identifier assigned to the second UE.
 30. A computer-readable medium for storing instructions executable by a processor, comprising: instructions to receive downlink control information for a first user equipment (UE) based at least in part on a group identifier associated with a non-orthogonal multiple access (NOMA) group comprising the first UE and at least a second UE; and instructions to receive a set of NOMA downlink transmissions at the first UE based at least in part on the downlink control information for the first UE. 